In our time, many are already accustomed to life with a smartphone so much that losing it for a couple of days already seems terrible! And the phone, and the Internet, and all the other usefulness of the smartphone have made our life more convenient and, a little more fun. One day my friend Samsung Galaxy S3 began to charge badly. Remembering the history of its appearance, later I realized that it was just a charger. Initially, the charger that was included in the kit charged it slowly, and I tried to charge it with an old charger from an LG phone: the connectors fit, it charged quickly, everything was fine. Until the charging input to the phone gradually loosened up, and in order for the phone charge indicator to appear, some effort had to be applied. Deciding that it was easier to buy a new charger - I did just that, buying a charger at the nearest kiosk for 170 rubles. It connected normally, but it was charging slowly and as a result it was completely discharged (I used a smartphone while charging). I went to the nearest service, left the phone for diagnostics and possible repairs. As a result, this trip cost me 1000 rubles. - they said that they soldered the input socket. I don’t know what they soldered, but the result is the same - the old charger that was charging is not visible, the new charger is charging slowly. The service offered me to leave the phone with them for a couple of days for further diagnostics. I decided to solve this issue myself. To begin with, I bought a new battery (original Samsung - for 700 rubles). Having searched for information on the Internet, I found a very useful article that helped me (I hope now for sure)! At least now it is clear that the reason for the slow charging was the strength of the supplied current. I installed a program that shows how much mA is supplied. The original battery, as well as the new Chinese one, showed a figure from 100 to 300 mA. Should be a value close to 1000 mA. That's why it is charging slowly. As a result, I made two almost non-working chargers - one: a USB-phone cord - I took it from the original charger and connected it to the power supply (the one that plugs into the outlet). As a result, it will charge now with indicators of 500-700-900 mA. Hooray!
The text I found on the forum http://mdforum.ru/showthread.php?t=11132 is below:
Everything written below is intended primarily for users of Samsung Galaxy S III (international version GT-I9300) with original 2100mAh battery
First of all, you need to make sure that the battery in the phone reaches the current put to it.
We put a small but useful program with the GalaxyChargingCurrent widget, in which we will only look at the current max readings. For the purity of the experiment, the battery charge should be less than 90%, and even better, less than 70%. Why exactly? - The answer is at the very end under the spoiler "note". We turn on the body for charging from the original (SAMSUNG) network adapter in the outlet and look in the menu-> settings-> battery to see if it is charging from the mains (AC), and not from (USB). Then we look at the GalaxyChargingCurrent indication of the current max. Ideally, for charging from the mains, it should be 1000 (just 1A, as written on the adapter). But if it is 800-900, then it is also normal. If it shows 460 when charging from the network, then the body has decided that the charge comes from USB.
Charging the smart in the off state will determine which way to dig (the normal charging time of the original battery is from 2 to 2.5 hours, slight errors are possible).
If the switched off smart is charging for about 2.5 hours, and the switched on longer, then you have problems on the part of the "software".
If the switched off smart is charging for more than 3 hours, then there are problems with the hardware.
An old/faulty/used/dying battery can be charged in less than two hours (there are known cases of charging up to 100% in one! hour).
Problems with the "software" and how to fix it
The reason may be the increased charge consumption. In other words, the battery drains faster than it charges. This can happen for several reasons.
- First reason- this is you, and the second one is all yours... Sorry =) No matter how ridiculous it may sound, but sometimes the user himself is to blame for everything. Do not use the smart to the fullest while it is charging. It is not recommended to play "heavy" games or run power-intensive applications while charging. The more actively you use the smart, the longer it will charge. Any connection (data transfer via USB, 3G or Wifi) affects the duration of the charge, the active connection is even more so, because it causes the battery to warm up. With an increase in temperature for every 10 degrees, the reaction rate increases by 2-4 times (Vant Hoff ©), in this case, the process of self-discharge and current leakage in the battery increases by 2-4 times, it wears out faster, not to mention the discharge. With an active connection, the charging time may increase several times and at the same time the full charge signal will not quite correspond to the truth (temperature and charge time limit on the part of the microcircuit). Based on this, the charge when the phone is turned off at all reduces the destructive processes for the battery during charging by 4-8 times and reduces the charge time itself. Conclusion: put the body on charge - forget about it until it is fully charged. Relax and let him rest =)
- The second reason- "spontaneous" charge consumption by smart. You seem to be doing nothing, and the charge is literally melting before your eyes, the body starts to lag, respond to your actions with a long delay, the rendering of the interface slows down. There is also a strong heating in the lower part (in the area of \u200b\u200bthe SIM card / flash drive) - the smart heats up more than usual (I personally noticed heating up to 49 ° C). This is a sign of a power-intensive application running, possibly in the background. Or an error occurred in the application, it hung and the android tries to fix everything on its own, while consuming a charge in excess of the usual. Try to stop all currently running programs (for Samsung Galaxy S III - a long press on the HOME button brings up the task manager, with which you can end everything). If this does not help, then remove the body from charging, disconnect the battery for a couple of minutes, insert it back and reconnect to charging. In the future, you need to figure out the culprit and disable or reconfigure.
- Third reason- a frozen battery. Do not charge the battery, after exposure to negative temperatures, wait until it warms up to the ambient (room) temperature and its energy properties return to their original values. When cooled, the processes inside the battery slow down. Therefore, with the active use of the phone, a premature message about a complete discharge is possible, although there is still a margin. The effect is similar to high internal resistance, but is reversible. Due to the slow chemical reaction, the battery simply does not have time to supply the required amount of energy, resulting in a voltage drop. It is precisely because of the slowed down processes that charging a cooled battery will be ineffective. Moreover, it causes him some harm. Wait until the battery temperature reaches room temperature.
Hardware problems and fixes
- Bad contact. It is necessary to clean the USB socket in the body itself, the wire plug, the adapter socket. If you don’t know how, don’t know how, don’t want to, are afraid - take the body to a service center or to any trustworthy phone repair office and for a nominal fee they will clean not only the USB socket, but also microphones, speakers, etc. purge and lubricate (just kidding). Didn't work - read on.
- The standard USB cable is defective. There are two options here: crimp the microUSB plug or disassemble the microUSB plug and solder it or crimp the wires again. If you don't know how, don't know how, don't want to, are afraid, a new USB cable will help you. How to choose a quality wire - only by scientific poke. We try different wires and compare the results in GalaxyChargingCurrent and charging time. Perhaps the original Nokia cable CA-101 will help you. Also remember that not all wires are equally useful - do not try to use wires longer than one meter. Didn't work - read on.
- Adapter defective. At the moment, there is only one option - we get a new one. Or, at your own peril and risk, disassemble your adapter, repair it and share the result. Do not forget that the new adapter must meet two conditions: microUSB connector and output voltage / output 5V and 1000mA (= 1A). 5V is mandatory, more is IMPOSSIBLE, less is possible, but to no avail. 1000mA(=1A) - the maximum that the body will take if charging is 2000mA(=2A) - it's not scary (the body will take only 1000mA(=1A)). The best option is a monolithic charger (without the possibility of disconnecting the adapter and wire). Not only the GNUSMAS adapter can work, but also NOKIA, HTC and others. Didn't work - read on.
- Battery defective. Signs of an old/failed/used/dying battery are rapid discharge and swelling. Pull the akum out of the body and look at it in profile, for example, at the edge with the connectors. If the upper and lower planes are noticeably convex, change it to a new one. A sign of a faulty battery is the spontaneous shutdown of the smart when the remaining charge is more than 5%. You may notice screen flickering before shutting down. Also, a healthy battery, charged up to 100% (when the green diode lights up), cannot lose more than 1% during the smart boot process. The procedure for checking the battery for a malfunction is to charge until fully charged (when the green diode lights up), disconnect from charging, turn off the smart and turn it on after a couple of minutes. If the battery has lost more than 1%, then the battery is defective. 1% can be "lost" during the shutdown process (shut down applications) and during the startup process (a large number of applications in startup), in a normal situation, this procedure requires much less energy and, accordingly, after turning on the smart with a good battery, the readings will remain at 100 %. Didn't work - read on.
- Phone is defective. There are two answers here: Krupsky and Delchev. But seriously, we repair in a service center or in any trustworthy phone repair office. Or buy a new phone.
and one more thing (helped some):
Deleting the file /data/system/batterystats.binAfter deleting the named file and rebooting, the problem with charging is immediately solved. If the problem recurs in the future, then you need to delete this file again.
Battery calibration.To solve all charging problems, you need to calibrate the battery.
Note: The charge time for all Li-ion batteries at an initial charging current of 1C (numerically equal to the nominal value of the battery capacity) is on average 3 hours. Full charge is achieved when the battery voltage is equal to the upper threshold, and when the charge current decreases to a level approximately equal to 3% of the initial value. The battery remains cold during charging. As can be seen from the graph, the charging process consists of two stages. At the first (over an hour), the voltage grows at an almost constant initial charge current of 1C until the upper voltage threshold is first reached. At this point, the battery is charged to about 70% of its capacity. At the beginning of the second stage, the voltage remains almost constant, and the current decreases until it reaches the above 3%. After that, the charge stops completely.http://www.ixbt.com/mobile/review/lipol.shtml
Infinity, specially for Romashki-Club.
In this article, you will learn about why the phone is charging slowly, as well as how to fix it.
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Surely you have encountered a problem when your smartphone was quickly charging, and at the same time it was also quickly discharged. Typically, users begin to face such a problem within 3-5 years after purchasing a new mobile smartphone.
So, today we will look at many reasons and problems due to which not only your smartphone suffers, but also your nerves when working with it.
Why is my phone charging slowly?
Problem #1: You have a bad cable
If your phone charges slowly, it can only mean that there are a lot of background applications running on it, or the USB cable that you use to charge your smartphone does not have enough power.
Indeed, in everyday life we do not notice what is happening with our USB cables. For example, modern cables tend to bend and fall. But in the end, this can lead to its breakdown and replacement with a new one.
If you want to tell a working cable from a non-working one, all you have to do is look at the bottom of the USB connector. You will see two thin small "cloves" that hold the USB cable securely connected to your device. You also need to inspect the front of the connector. You will find a row of tiny little teeth.
Thus, you will have to buy a new USB cable in one of the digital equipment stores.
Problem #2: You have a weak power supply
In the event that you charge your smartphone from a computer, then you need to understand that the USB port of a computer or laptop does not produce enough power. As a result, it can be noted that charging from a laptop produces about 1.2A, and charging a smartphone from the network produces 2.1A.
Therefore, if you think that your USB cable is to blame for slow charging, then you need to try charging your smartphone from the network. Please note that this requires an appropriate adapter that has standard values suitable for your smartphone, otherwise it may lead to a short circuit, or again, to slow charging.
Problem #3: You have a weak adapter
The problem of slow charging, as mentioned above, can also be an adapter. Therefore, if your USB cable is original, but the adapter is not, then the problem lies with it.
Problem #4: You have an outdated smartphone model
Modern mobile devices are subject to new technologies that support fast charging. Therefore, if your phone charges extremely slowly compared to others, then you should answer the question. Is my smartphone outdated?
However, even in the case of modern devices, this problem takes place. For example, for new devices, special patented adapters and cables are made, which, according to the standard, give out about 3.5A. Therefore, if you charge a new smartphone with a charger that delivers 2.1A, then your smartphone will certainly take longer to charge.
Problem #5: You have a bad battery
You can often find a situation where smartphone manufacturers released models that came with a defective battery and other malfunctions.
Therefore, in this case, you need to contact the manufacturer, or simply purchase a new rechargeable battery for your smartphone.
Problem #6: You get stuck on your smartphone
A surprisingly large number of smartphone users are unaware that the biggest battery eater on their phone is the screen. Thus, it is necessary to understand that the high brightness of the display will definitely speed up the decrease in battery power on your smartphone.
So if you need your phone to charge quickly, let it rest while it's on the charger.
Problem #7: Background apps eat up your battery
Even though your screen is the biggest battery drainer on your smartphone, you may also have a few hidden apps running in the background that drain your smartphone battery quickly. After all, applications on Android tend to be constantly updated, even in the background.
The easiest solution to this problem is to open the application manager and close all background applications. When you find that one of the running applications is eating up your battery power, you need to uninstall it.
Problem #8: Your USB port is dusty, clogged
All day long your phone is kept in your pocket or purse with all the dust, dust and particles. Quite often, particles of debris, dust, dirt, etc. get into the USB port.
Therefore, you need to use a flashlight to inspect your phone's USB port. If you see that the USB port contains excess mass, you need to take any pointed tool. Be very careful not to damage any of the components of the port or you may end up with a bigger problem than you currently have. We recommend using a plastic (rather than wooden) toothpick.
Problem #9: The USB port is damaged
If you accidentally broke or bent a contact in the USB port of your phone while using your smartphone, then you have to carry out a small repair to replace the USB port in your smartphone.
Thus, if your smartphone is still under warranty, then you can apply for a warranty card to get a cheap or free repair.
Problem #10: USB Port Oxidized
Among other things, you may also have some corrosion from sweat or moisture. Corrosion is a particularly vicious problem, as it creates a layer on top of the connector pins that acts as a barrier to charging, but worse if you don't get rid of it. In such a case, it will continue to damage your device, causing more and more problems.
Therefore, if you want to rid your phone of corrosion, you should disassemble the device to determine the area of corrosion.
Worth noticing that corrosion can be removed with alcohol or vinegar.
- Wipe off any corrosion on the chip, and be careful not to get any vinegar on the chip's work area.
- Once you've covered the corrosion with vinegar, wait 10 minutes, then use a paper towel to remove the vinegar. Repeat this process until the corrosion is removed.
- After that, you will need to put the smartphone on the windowsill or in any place that is well ventilated. Leave the phone for 2-3 hours.
- Then assemble your smartphone and try turning it on!
Why is my phone charging fast?
Often, users also face such a problem when their smartphone charges very quickly.
So, let's look at what problems can be in this case.
Problem number 1. Your smartphone has the mCharge option installed
Modern smartphones are equipped with fast charging technology, which allows you to charge your smartphone in just an hour. But still, this option has one significant disadvantage, since when charging quickly, the smartphone’s battery gets very hot, from which its service life decreases by 1.5-2 times. Therefore, if you want your battery to last much longer, then disable this option.
Problem number 2. Your battery has failed
As you know, lithium batteries do not have such a high durability as lead batteries. Therefore, when the battery reaches the end of its service life, it begins to malfunction.
As a result, you may encounter the following problems:
- The phone charges quickly and discharges quickly
- Phone keeps restarting and shutting down
- The phone does not work without recharging for as long as it worked before.
The way out of this situation is to buy a new rechargeable battery for your smartphone.
Problem number 3. You are using Air Mode
When you are constantly connected to your cellular network due to low signal strength, battery life drops a lot. So if you use "airplane flight mode", then your phone will hold a charge much longer than when it is turned off Air mode.
So to answer the question again "How to charge your smartphone", we advise you to turn on airplane mode.
With this, we will probably end our article. We hope that you have found your way to solve the problem with slow smartphone charging!
Video: Android battery runs out quickly. We solve the problem
Video: TOP 7 reasons why your smartphone runs out of battery quickly
There are many reasons why the phone takes longer to charge than usual. Sometimes you can fix the situation yourself, and in certain cases you have to contact the service center.
Contact deterioration
The first reason why the phone charges longer than usual is the lack of a good contact: a damaged USB cable, a charger connector, or damaged contacts on the battery. Try to remedy the situation by removing the battery and cleaning the metal contacts, as well as cleaning the adapter connector and the USB cable plug.
Cable problem
The cable that connects the phone to the charger is rather fragile. Constant bending can damage it, and the smartphone will charge longer than usual. If obvious mechanical damage is visible on the cable (it has broken, torn, the upper braid is damaged), you cannot fix the situation at home. Head to the store for a new cable that doesn't cost too much.
Adapter failure
To check it, first try changing the USB cable from the adapter to the phone, if it can be disconnected from the charger. If in this case the phone also takes a long time to charge, try charging another smartphone with this adapter. So you can determine if the problem is in the adapter or in your smartphone. If the other phone also takes a long time to charge, change the charger.
Battery life exhausted
Every battery has a lifespan. On average, after 4-5 years, the capacity is lost, and it takes more time to charge the phone. In general, the more often you charge and discharge a battery, the faster it deteriorates. If the battery has exhausted its resource after six months, this is not normal, so you can safely contact the seller for a warranty. You can check the battery yourself. Pull it out and inspect: if the battery is swollen, it will have to be changed. True, not all smartphones have a removable battery.
Bad power supply
The process of charging a phone from computers, laptops or a car cigarette lighter always takes more time than charging from a regular outlet. USB ports in computers and laptops, like the cigarette lighter in the car, do not provide enough power, so the battery takes longer to charge than usual.
Charging a working phone
If the phone is charging while you are using it (watching YouTube videos, browsing Instagram or other social networks), the full charge process will take much longer. before leaving the phone to charge, it is better to close resource-intensive applications and leave it alone.
If your phone's battery isn't charging properly, don't assume it's just the battery or the charger that's the problem. Based on personal experience, the problem and its solution may be much easier than you think. If your smartphone or tablet is charging poorly or not charging at all, then check out 10 ways to fix these problems.
Why is the device not charging?
Problems arise in one way or another. Either the phone does not want to charge at all when it is connected, or the process is too slow. Here are some solutions for you.1. Bad contact
Very often, the metal coating inside the USB port and micro USB has poor contact, either through a manufacturing defect or cable wear.
All you have to do is turn off the device, remove the battery if possible, and clean the contacts inside with something like a needle or toothpick. Do this very carefully and carefully, then insert the battery and connect the charger again. 9 times out of 10, that's all you need.
2. Clean the charging port from dust and third-party fibers
Do you keep your phone in your jeans pocket? If so, then fibers may be the culprit: we've already lost count of how many times our clothing's fibers have caused a malfunctioning charger.
You can also repair the charging port by blowing compressed air through it.
3. Try another cable
The most fragile part of the charger is the cable. It is constantly bent, which over time can damage it.
The easiest way to diagnose a damaged cable is to take another one and see if it works properly with your device. If so, you know that the original charger wire is defective. If not, then you need to look for a solution further.
4. Use a different adapter
You have ruled out the presence of problems with the cable, then you need to check the performance of the charging device itself. This is much easier to do if you can pull the wire out of the adapter. We've come across a lot of chargers where the USB ports have worn out due to the endless plugging and unplugging of the cable.
Also check the charging/wiring function on other phones as this will help rule out the possibility that this is a problem with your smartphone. In addition, you must make sure that the outlet is working.
5. Remember - Safety First
Do not charge your gadget near water or in extremely hot or humid conditions. Do not keep the device connected to the charger for too long. Don't leave it charging all night when it only needs 2-3 hours. This may damage the hardware.If you want to replace the charger or its cable, be careful: cheap third-party adapters are quite dangerous. Recently, there have been many cases of fires in mobile phones because of them.
The video below captures one of those cases:
6. Replace battery
The life of a rechargeable battery does not last forever, and after several years of use, it loses its capacity. The more often you charge and discharge it, the sooner it will deteriorate. Of course, if the battery stops working after six months of use, then you need to apply for a warranty from the seller.
Some defective batteries are easy to identify by their appearance. If it is swollen, then it should be replaced immediately.
7. Charge from the right source
Charging from an outlet will always be faster than from a computer, because its USB ports have too little power. Thus, the phone charges much faster from the outlet.Also, the problem may be that you are using an adapter from another device, for example, from a Bluetooth headset, which is not designed for your gadget. This adapter does not supply enough current. In the case of the latest high-end smartphones, you may have a device that supports fast charging, but the adapter is not suitable.
8. Update the software or roll back to the previous version
Software updates can degrade the battery life of a mobile phone, especially when an old device gets a fresh version of Android. Newer smartphones and tablets are often optimized to take advantage of the latest software version.
If this happened to you and you can't find a solution, try rolling back to a previous version. You can, of course, first try to do a hard reset, as the manufacturers recommend, so as not to jeopardize the data on the device due to the old version of Android.
Likewise, sometimes the battery life of a smartphone can be greatly improved by a recent update.
9. Try turning it off
The use of heavy applications during charging affects the duration of the process. For example, if you are chatting on Skype or playing games, then the device will take longer to charge.Therefore, put the device on charge in the off state or in flight mode.
10. Calibrate the battery
Sometimes, the battery level displayed on the screen may differ from the actual one. Because of this, the behavior of the phone may seem strange to you. 
Many devices come with fast charging technology. Some, especially older, models do not have it, but still make up for interest quickly. This is convenient, manufacturers focus on this during presentations, and users get used to this state of affairs. But sometimes smartphones fail and it is not clear for what reasons the phone takes a long time to charge. There are a number of solutions to this problem. We suggest you familiarize yourself with the most popular.
Use "native" elements for charging
The simplest reason why the phone took a long time to charge may not have anything to do with the device itself. You probably have a bad cord, adapter, or weak power supply.
USB cables go through a lot, especially if they're shared by multiple people. They are thrown, bent, often stored in places where there are significant temperature fluctuations. So before blaming the phone and trying to do anything to it, check the cords. Try to use only the one that came in the box, as it can be adapted to the type of charging in your smartphone.
The same goes for the cable. Use only "native" equipment for charging. And by the way, do you keep using the old block even after buying a new phone? If so, stop doing it and use a new charger.
Many people like to charge their mobile phones using the port on the computer. This is not always ideal as the charging speed is highly dependent on the age of your computer and whether it uses modern connectors.
Nothing can replace a direct source for charging your own phone (socket). Thus, before making any drastic decisions, simply plug your smartphone into a power outlet through stock accessories, and also check if one of the components is damaged. 
Check the charging port
Your cable is not the only element that can cause your phone to charge more slowly. The connector can also be damaged by moisture, dust, corrosion, or other physical or chemical attack. Look at the port, examine it under a magnifying glass and with a flashlight for visible flaws. Of course, the port rarely causes a slowdown in charging, but it is better to immediately exclude this item from the list. 
If there is something foreign in the port, carefully remove it with a toothpick, and not the hardest and sharpest, so as not to damage the contacts when trying to fix the problem.
Check background processes
The reason why the phone is charging slowly can be background processes that actively “devour” the percentage of charge or have a negative impact on the operation of the mobile.
Android and iOS now have the tools to understand what apps are running in the background. For Android devices, check the battery usage menu located in Settings - Battery. 
On your iPhone, select "Battery" in the "Settings" app, and there you will see applications that use the battery more actively than others. When you find the culprit in the loss of battery percentage, remove it and see if battery life and charging speed improve.
Remove viruses
The site has a large article on the fight against virus programs on Android, we recommend that you read it. But the main thing to do is to download a program for searching and removing malware, for example, from Dr.Web, ESET or Kaspersky Lab. Perform a full scan of the device and destroy any suspicious components that are found. Also dig into the list of applications and uninstall any non-system ones that you don't know and don't use. Especially if they have or require a lot of permissions.
Update Firmware
Software updates arrive on each device. Sometimes they come often, sometimes rarely, but it is not recommended to skip them, as they carry updated security patches, as well as improved technologies and functions. Sometimes it happens that fast charging does not work out of the box, which can cause the device to charge slowly. But in subsequent updates that come via OTA, the manufacturer will unlock fast charging.
Each firmware has this item in different places, but you will probably immediately see it in the settings. Typically, the user is notified of a new update.
Also, if you switched to custom firmware, then it makes sense to return to stock, because your third-party assembly may not support fast charging, as a result of this, the Android device charges more slowly. It is often turned off by romodels for the sake of increasing battery life.
Calibrate the battery
There is also material on the site about this, but here we will mention the safest and most proven method recommended by Google.
- Discharge your smartphone completely.
- Leave it to recharge and leave it on for at least eight hours (the device must be turned on).
- Unplug the cable, turn off the device.
- Put it back on to charge for one hour.
- Remove the cord, turn on the gadget and use it for a few minutes.
- Turn it off and put it back on charge for an hour.
- Turn it off (it is fully charged), activate and you can use it.
The method is not the easiest, but it often helps to get the charge controller working, even when the phone is quickly discharged.
Do not use your smartphone while it is charging
Are you using the device while it is charging? If so, you may be the reason why the device is taking a long time to make up interest. After all, your actions in the system create an additional load on the processor, screen, so they immediately consume part of the incoming energy. If you want fast charging, do not use your smartphone while it is connected to a power outlet.
It is also worth mentioning the impact on charging applications such as Facebook. They drain your cell phone very quickly. Therefore, this application, in the first place, is not recommended to use when you are charging your phone.
Replace battery
If you've followed all the tips from the list and the battery is still charging very slowly, then it's time to think about replacing it or going to a service center. 
Lithium-ion batteries do not last forever and can only be charged a limited number of times. After that, they slowly lose capacity, begin to behave extremely strange, quickly discharge, actively lose their charge in the cold, and sharply lose a huge amount of interest “out of the blue”. Therefore, it may be that the battery is the reason for the slow charging. When it is in operation for more than two years, it is not surprising that it loses some of its properties. It cannot be repaired, it makes sense to buy a new one. And try to find the original one, as third-party ones may be smaller in capacity and may not support fast charging at all.
Now you know what to do when the mobile is not charging well. If the tips found in this article do not help, consider taking your device to the nearest service center to have an expert determine what is causing the problem. Or send it under warranty if it's still valid.
