About this replacement
Lenovo 14w Gen 2 / 14e Chromebook Gen 2 — 11.52V Li-Polymer Replacement Battery (5B11B36301)
This 11.52V, 4800mAh (55.3Wh) Li-Polymer battery replaces the original cell in the Lenovo 14w Gen 2 and 14e Chromebook Gen 2 series, covering models including the 82N8001JIV, 82N8000QCK, and 82M1000NIX. It matches OEM part numbers 5B11B36301, L20D3PG1, L20L3PG1, L20M3PG1, L20M3PG4, and several others listed in Lenovo's service documentation. The connector, BMS handshake profile, and physical dimensions (283.40 × 99.00 × 5.20mm) match the original fitment exactly.
- 14w Gen 2 and 14e Chromebook Gen 2 platform fit: Both the 14w Gen 2 and 14e Chromebook Gen 2 share the same battery bay dimensions, 11.52V three-cell architecture, and EC communication protocol. That is why a single part number covers both lines — the BMS firmware expects the same charge profile and EEPROM data structure on either platform.
- Bench tested on actual hardware: We cycled this cell through full charge and discharge passes on a 14w Gen 2 unit, monitoring BMS handshake confirmation, charge acceptance rate, and cutoff voltage at the low end. The cell reached 100% charge without triggering a protection trip and held voltage within spec under sustained CPU and display load.
- Post-install BIOS learn cycle: After fitting this battery, run the laptop down to hibernate cutoff, then charge it uninterrupted to 100% before using it again. This gives the BIOS fuel gauge IC a full reference point against the new cell, clears the inaccurate health warning that appears after every cell swap, and resets the charge learn cycle so the percentage readout stays accurate.
Why the 14w Gen 2 shuts down at 20–30% after a battery swap
The fuel gauge IC retains voltage-to-capacity mapping data from the old cell. When the new cell's voltage curve differs even slightly, the IC misreads the remaining charge and triggers a low-battery shutdown well above the actual cutoff floor. This is not a fault with the replacement cell — it is a calibration mismatch. Running one complete discharge-to-hibernate cycle followed by an uninterrupted full charge forces the IC to relearn the curve against the new chemistry. After two or three full cycles, the shutdown point drops back to the correct level near 5–8% remaining.
BIOS reporting wrong Wh rating in system information after replacement
Lenovo's BIOS reads battery Wh capacity from EEPROM data stored on the battery's embedded controller, not by measuring actual cell capacity in real time. When the EEPROM-reported value differs from the physically installed cell's rated capacity, the system information panel shows an unexpected Wh figure. This does not affect charging, runtime, or safety — it is a metadata read from the old EEPROM template used during manufacturing. If the BIOS shows a figure that does not match the 55.3Wh spec, confirm the BIOS is fully updated, as some firmware revisions corrected how battery EEPROM data is displayed.