Reasons why your phone might still drain the battery:
The battery is old or damaged: As batteries age, they lose their capacity and start to drain more quickly. If your phone is a few years old, it's possible that the battery is simply old and needs to be replaced.
There are apps running in the background: Even when your phone is powered off, some apps can still run in the background. These apps can drain your battery even when you're not using your phone.
There is a wakelock: A wakelock is a software bug that prevents your phone from going into deep sleep mode. This can cause your battery to drain even when your phone is powered off.
There is a hardware problem: In rare cases, there may be a hardware problem with your phone that is causing the battery to drain. If you've tried all of the above steps and your phone is still draining battery when it's powered off, you might need to take your phone to a repair shop.
Other Causes:
After the phone is turned off, some functions will not be completely powered off. The internal circuit of the phone will perform micro-circulation and cause a loss of power. At the same time, the battery will self-discharge when it is not in use, which will also lead to power loss. It's a normal phenomenon.
If the phone is not used or charged for a long time, the battery may trigger over-discharge protection, resulting in abnormal charging or failure to charge. If the phone is idle for a long time, it is recommended to recharge it from time to time to maintain about 50% of the power.
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