Lenovo Battery Internal 4 Cell 72Wh LiIon

The Lenovo 5B10W51889 is an internal notebook battery for Lenovo ThinkPad Z16 G1 models 21D4 and 21D5, and ThinkPad Z16 Gen 2 models 21JX and 21JY. Its part number helps identify the specific battery when checking a replacement for one of these listed computers.

It uses lithium-polymer technology and has four cells. The stated capacity is 4640 mAh, with an energy capacity of 72 Wh and an output voltage of 15.52 V. These electrical specifications help distinguish this battery configuration from other notebook batteries.

Installed inside a compatible notebook, it supplies power when the computer is away from an external power source. It is also the replacement part for servicing or restoring battery operation in the listed ThinkPad models. The compatible references cover both the Z16 G1 and Z16 Gen 2 families.