Lenovo Battery Internal 4 Cell 52.5Wh LiIon SWD

Lenovo 5B11M90029 is an internal lithium-ion battery for Lenovo laptops. Fitted inside the computer, it serves as a replacement power source rather than an external battery pack.

Its four-cell construction and 15.48 V rated voltage identify the battery’s configuration. The distributor lists a capacity of 53 Wh; L21D4P71 is the model marking printed on the unit and another identifier for this battery.

Use it to replace an internal laptop battery when Lenovo part 5B11M90029 is required. It stores energy for use away from an external power source.