52.5Wh lithium-ion internal

Lenovo 5B10W51906 is an internal replacement battery for compatible Lenovo ThinkPad laptops. Its four-cell lithium-ion pack has a stated capacity of 52.5Wh and fits inside the computer, making it suitable when the internal battery needs replacement.

Compatibility includes ThinkPad P16s Gen 1 types 21BT, 21BU, 21CK and 21CL, plus ThinkPad T16 Gen 1 types 21BV, 21BW, 21CH and 21CJ. The listing also names ThinkPad T16 Gen 2 types 21HH and 21HJ. Check the laptop’s type against these references to confirm it is one of the variants listed for this part.

With a four-cell Li-ion design and 52.5Wh energy capacity, this battery is intended to restore battery operation in one of those supported ThinkPad models.