FOCUSTEC LK03XL 55.8Wh 11.55V laptop battery

55.8Wh Li-ion replacement battery

This 55.8Wh lithium-ion battery operates at 11.55V and supplies 4835mAh of capacity for HP Envy X360 convertible models. It replaces part numbers such as LK03XL, L09281-855 and 916814-855 across the 15-inch BP, BQ, CN and CP series as well as the 17-inch AE, BW and CE families. The cell is brand new and built with a smart protection circuit. Buyers who need a higher-capacity pack or a different voltage will not be served by this unit.

Smart chip and direct-fit terminals

The integrated smart chip communicates with the laptop firmware to report accurate charge levels and to guard against over-charge, over-discharge and short-circuit events. No separate driver, calibration utility or firmware update is bundled; the battery is recognised automatically when seated. Users who expect a software suite for battery health monitoring will not find one included.

Tool-less swap with connector alignment

Installation requires only the removal of the bottom case screws and disconnection of the old pack; the replacement uses the original keyed connector so polarity mistakes are prevented. The most common issue is forgetting to detach the internal battery cable before lifting the old unit, which can trigger a temporary fault code. No adhesive strips or soldering are involved.