If u get your battery and it's not work, eg, computer will not boot up with battery, or computer will shutdown when battery level is #% and and full charge only ##mAH, or...Might try to completely discharge the battery or reinstalling it and the battery will work.
Maybe at the time you open the package, the battery has been lying in box for too many days. And try to completely discharge the battery will help the battery warm up and enter the work quickly, i.e. use the computer without the charger and then turn the computer off and then charge.

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Compatible Part Numbers:
Lenovo L15M3PB0 L14M3P21 L14L3P21 L14M2P21 L14L2P21

Compatible for Lenovo Models:

Flex 3 1470/1480/1570/1580
Flex 4 1470/1480/1570/1580
Ideapad 300S-14/300S-14ISK/300S-14IKB
Ideapad 300S-15/300S-15ISK/300S-15IKB
Ideapad 310S-14/310S-14ISK/310S-14IKB
Ideapad 310S-15/310S-15ISK/310S-15IKB
Ideapad 320S-14/320S-14ISK/320S-14IKB
Ideapad 320S-15/320S-15ISK/320S-15IKB
IdeaPad 500S-14/500S-14ISK/500S-14IKB
IdeaPad 500S-15/500S-15ISK/500S-15IKB
IdeaPad 510S-14/510S-14ISK/510S-14IKB
IdeaPad 510S-15/510S-15ISK/510S-15IKB
IdeaPad 520S-14/520S-14ISK/520S-14IKB
IdeaPad 520S-15/520S-15ISK/520S-15IKB
Edge 2-1580 Series
XiaoXin i2000 Series
Lenovo M51-80 Series
Lenovo S41-35 Series
Lenovo S41-70 Series
Lenovo S41-75 Series

As a Side Note:
The battery model is L15L3PB0, you might wanna consult your laptop's technical specs to confirm compatibility before purchase. If you're unsure, please feel free to contact our customer service team.