About this replacement
Lenovo 100e / 300e Chromebook 2nd Gen — 11.55V Li-Polymer Replacement Battery (L19L3PG1)
This 11.55V, 4050mAh (46.78Wh) Li-Polymer cell replaces the original battery in the Lenovo 100e Chromebook 2nd Gen, 300e Chromebook 2nd Gen, and a broad range of related Chromebook 100e and 300e variants. It cross-references OEM part numbers including L19L3PG1, L19C3PG1, L19M3PG1, and 5B10X65684, among others. If your existing battery no longer holds a charge or the system shuts down unexpectedly, this cell restores normal portable operation.
- 100e and 300e Chromebook 2nd Gen compatibility: Both model lines share the same 11.55V three-cell architecture, identical connector pinout, and the same BMS handshake protocol — which is why a single cell covers both. The BMS communicates state-of-charge data over the same SMBus line regardless of chassis variant.
- Bench tested on actual hardware: We ran this cell through charge-discharge cycles on a 300e 2nd Gen chassis. The BMS accepted the cell without error flags, reported correct voltage across all three cells, and the fuel gauge IC initialised without a reset prompt.
- Post-install calibration cycle: After fitting this battery, run one full discharge down to the hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to re-baseline against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the Chromebook shuts down at 20–30% after a battery swap
The fuel gauge IC on the 100e and 300e platforms stores discharge curve data tied to the original cell's chemistry profile. After a swap, that stored curve no longer matches the new cell's actual voltage behaviour under load. When the CPU and display both draw full power simultaneously, the new cell hits a voltage cliff earlier than the old curve predicts — and the BMS triggers a hard shutdown before the gauge reaches 0%. Running two or three full discharge-to-hibernate cycles retrains the fuel gauge IC against the new cell and eliminates premature shutdowns.
BIOS reporting battery health as "poor" or "replace" immediately after installation
This is an EEPROM data mismatch, not a fault with the new cell. The BIOS reads health metadata written by the original battery's internal EEPROM, and the new cell's counters show zero cycles against a high-cycle baseline — which the firmware interprets as degradation. To clear it, open Lenovo Vantage or access the BIOS battery diagnostics, then run a full battery learn cycle. After one complete discharge-to-hibernate and uninterrupted recharge, the health indicator should update to normal. If the warning persists after two full cycles, verify the BIOS firmware is on the latest version for your specific model.