Lenovo Battery Internal 4 Cell 42Wh LiIon SMP

The Lenovo 5B11M90066 is an internal battery for the X12 Detachable Gen 1 laptop. This OEM Lenovo component stores electrical energy for use when the computer is away from a mains supply.

Its four-cell configuration provides an energy capacity of 42 Wh, with a listed voltage of 7.72 V. These specifications identify the battery pack for this particular laptop model.

Designed as an internal replacement component, it is intended for the X12 Detachable Gen 1. It is not an external power adapter or a general-purpose portable battery. The stored energy supports mobile use, such as working or studying away from a desk or continuing to use the laptop when mains power is not immediately available.