About this replacement
Lenovo IdeaPad Slim 5 14ABR8 — 11.31V Li-Polymer Replacement Battery (5B11K39362)
This is an 11.31V, 4100mAh (46.37Wh) Li-Polymer battery for the Lenovo IdeaPad Slim 5 14ABR8 series. It fits the 82XE variant range, including 82XE0001RK through to the broader 82XE lineup. Cross-reference OEM part numbers L22B3PA3, L22C3PA3, L22D3PA3, L22L3PA3, L22M3PA3, 5B11N45396, or SB11K39363 before ordering.
- IdeaPad Slim 5 14ABR8 series compatibility: All 82XE variants share the same three-cell Li-Polymer pack, connector pinout, and BMS handshake. The voltage rail sits at 11.31V nominal — any deviation trips the EC and prevents charging from starting.
- Bench tested on actual hardware: We ran this pack on a 14ABR8 chassis. The BMS initialised on first boot, the EC recognised cell chemistry without firmware prompts, and charge current ramped correctly through CC/CV phases to full capacity.
- Post-install discharge cycle: After fitting, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
The IdeaPad Slim 5 EC reads health data from the battery's EEPROM on first connection. When a new cell arrives with factory EEPROM values that differ from the old pack's learned data, the BIOS flags it as degraded or unknown. This is not a fault with the replacement cell. Run one complete discharge-to-hibernate then a full uninterrupted charge — the BIOS battery learn cycle rewrites the stored health data against the new cell's actual charge curve. The warning clears after one to two calibration cycles.
Laptop shutting down at 20–30% remaining after battery swap
The fuel gauge IC on this platform maps state-of-charge against the old cell's discharge curve stored in memory. A new cell has a different voltage-versus-capacity profile, so the IC misreads remaining charge and triggers shutdown well before the pack is actually empty. The cutoff happens because the reported voltage hits the low-threshold before the gauge recalibrates. To fix it, run two full discharge-to-hibernate and charge-to-100% cycles — by the second cycle, the fuel gauge IC recalibrates to the new cell and the percentage readout stabilises above 11.1V at the point the laptop would otherwise shut down.