The warranty period of batteries is usually two or three years.
See the battery manual for details.
However, if the battery is well maintained every day, the battery life can be improved.
You can download a Tencent mobile phone housekeeper to fully understand the battery usage status.
Tencent mobile phone housekeeper is very good. You open Tencent mobile phone housekeeper and enter health optimization. There is also battery testing, which can detect the health of the battery.
Intelligently adjust system parameters and turn off power consumption function settings, as well as ordinary power saving, intelligent power saving, network disconnection power saving, CPU deep power saving and so on.
These will help you extend battery life.
I hope my answer can help you.