L15M2PB0 Lenovo Chromebook 11.6 Compatible Battery 7.6V 4400mAh

Lenovo Chromebook 11.6 / 100S-11IBY — 7.6V Li-Polymer Replacement Battery (L15M2PB0)

This is a 7.6V 4400mAh (33.44Wh) lithium-polymer battery for the Lenovo Chromebook 11.6 and 100S-11IBY. It replaces OEM part numbers L15M2PB0, L15L2PB0, 5B10J46561, 5B10J46559, and 5B10J46560. It fits the physical bay and matches the connector and BMS protocol these boards expect.

• Chromebook 11.6 and 100S-11IBY compatibility: Both models share the same 7.6V battery rail, identical connector pinout, and the same BMS handshake protocol — that's why they take the same cell. The 100S-11IBY uses an identical charge circuit, so swapping between these two units carries no compatibility risk on the battery side.
• Bench tested on actual hardware: We ran this cell against the Chromebook charge controller and confirmed the BMS handshake completes cleanly. The protection circuit trips correctly at low-voltage cutoff and resets without fault on reconnection.
• First-cycle recalibration after swap: After fitting this battery, run one full discharge down to the hibernate cutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to map its readings against the new cell. Without this step, Chrome OS will report inaccurate capacity estimates for the first several cycles.

Why Chrome OS shows "Battery health: poor" immediately after fitting a new cell

Chrome OS reads battery health data from EEPROM embedded in the battery pack — not from a live measurement. When a new cell goes in, the EEPROM values don't match what Chrome OS expects from a "learned" battery, so it flags it as degraded. This isn't a fault with the replacement cell. Running one full discharge-to-hibernate then a full uninterrupted charge clears the warning by completing the BIOS battery learn cycle. After one or two full cycles the reported health figure normalises.

Chromebook shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's actual voltage curve. The gauge reads 20–30% remaining but the cell voltage has already dropped to the point where it can't sustain the CPU and display load simultaneously. The laptop shuts down to protect the cell, even though the percentage looks safe. Fix this by completing the recalibration cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption — the gauge recalculates its curve and the shutdowns stop.