About this replacement
Lenovo Legion Go 8APU1 — 7.82V Li-Polymer Replacement Battery (5B11M36296)
This 7.82V, 10200mAh (79.76Wh) lithium-polymer battery is a direct cell replacement for the Lenovo Legion Go 8APU1 handheld gaming console. It fits the internal battery bay and connects to the same BMS harness as the original. OEM part numbers covered include 5B11M36296, 5B11M36298, L23B2PK0, L23C2PK0, L23D2PK0, and related variants.
- Legion Go 8APU1 fitment: All listed OEM part numbers share the same 7.82V two-cell configuration, identical connector pinout, and BMS handshake protocol. Swapping between them does not require firmware changes — the BIOS reads cell data from the EEPROM on the protection board.
- Bench tested on actual hardware: We cycled this cell through full charge and load discharge on the Legion Go platform. The BMS communicated correctly, charge termination triggered at the expected voltage, and no false over-temperature flags fired during sustained GPU and CPU load.
- Post-installation calibration: After fitting this cell, 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 the system logs after every cell replacement.
BIOS reporting poor battery health immediately after replacement
The Legion Go stores battery wear data in EEPROM on the original protection board. When a new cell installs, the BIOS reads stale wear metrics carried over from the old pack and flags the battery as degraded before any real usage. This is a data mismatch, not a cell fault. Running the battery learn cycle — full discharge to hibernate, full uninterrupted charge to 100% — rewrites the learned capacity baseline and clears the warning.
Legion Go shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC's stored discharge curve no longer matches the new cell's actual voltage profile. Under sustained GPU and CPU load, the cell voltage drops faster than the old curve predicts, hitting the BMS cutoff threshold while the OS still shows 20–30% remaining. The fix is calibration: discharge fully to automatic hibernate, then charge to 100% without interruption for two consecutive cycles. After the second cycle, the fuel gauge recalculates against the new cell and shutdown behaviour normalises.