Lenovo 5B10W51865 is an internal lithium-ion replacement battery, identified by Lenovo as FRU model L21M4P72. It is intended for a compatible laptop designed for this part, providing stored energy for portable use away from an external power source.
Its energy capacity is 52.5 Wh, with a battery voltage of 15.48 V and a cell voltage of 3.87 V. These ratings identify the battery’s electrical configuration and help distinguish it from parts with different specifications.
The listed weight is 202 g. Lenovo associates this battery with the SDS_Simplo-2602 safety data sheet, the documentation reference for this part.