About this replacement
Lenovo Chromebook 100s / IdeaPad 310-14ISK — 7.6V Li-Polymer Replacement Battery (L15M2PB2)
This 7.6V, 3800mAh (28.88Wh) Li-Polymer cell replaces the original battery in the Lenovo Chromebook 100s and IdeaPad 310-14ISK. It matches the OEM voltage and capacity spec so Chrome OS and Windows fuel gauges read correctly after calibration. Physical dimensions are 204.05 × 86.44 × 10.24mm — same footprint as the L15M2PB2 and all cross-reference part numbers listed below.
- Chromebook 100s and IdeaPad 310 compatibility: Both platforms share this cell because they run the same 7.6V battery bus, use an identical connector pinout, and the BMS handshake protocol matches across all L15-series part numbers including L15M2PB2, L15L2PB2, L15C2PB2, and L15C2PB6.
- Bench tested on actual hardware: We cycled this cell on a Chromebook 100s unit and monitored BMS communication through full charge and discharge. The protection circuit held charge termination correctly at 8.7V and triggered low-voltage cutoff at 6.0V without false trips.
- Post-install discharge cycle on Chrome OS: After fitting this battery, let the Chromebook discharge fully until it shuts itself off, then charge uninterrupted to 100% without using the device. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
Why the Chromebook 100s shuts down at 20–30% after a battery swap
The fuel gauge IC on the Chromebook 100s uses stored discharge curve data from the old cell to predict remaining capacity. A new cell has a different internal resistance profile, so the IC hits a voltage cliff earlier than the percentage shown on screen suggests. The laptop interprets the sudden voltage drop under combined CPU and display load as a critically low state and cuts power to protect the system. Running two full discharge-to-hibernate cycles recalibrates the fuel gauge IC against the actual curve of the new cell.
BIOS reporting battery health as "poor" or "replace" immediately after installation
The BIOS reads health status from EEPROM data that carries over from the old battery's wear history — it does not automatically clear when a new cell is installed. On Lenovo IdeaPad and Chromebook platforms, this warning persists until the battery learn cycle completes. Open Lenovo Vantage on Windows or use the Chrome OS battery diagnostic, then run a full charge-to-discharge cycle with the lid open and AC removed. After one complete cycle the EEPROM updates and the health warning clears.