Lenovo Legion Go 8APU1 Replacement Battery L13B2PK0 7.82V

Lenovo Legion Go 8APU1 — 7.82V Li-Polymer Replacement Battery (L13B2PK0 / L23M2PK0)

This 7.82V, 10350mAh Li-Polymer battery replaces the original cell in the Lenovo Legion Go 8APU1 handheld gaming console. It fits the 8APU1 chassis directly, using the same connector and BMS handshake as the factory unit. Capacity figures are taken from the product data: 10350mAh / 80.94Wh.

• Legion Go 8APU1 fitment: The 8APU1 uses a dual-cell Li-Polymer pack on a shared 7.82V nominal rail. Both OEM part numbers — L13B2PK0 and L23M2PK0 — cross to the same physical pack with the same BMS pinout, so the Windows battery driver recognises the cell without a firmware workaround.
• Bench tested on actual hardware: We cycled this pack through full charge and load discharge on the 8APU1 board. The BMS reported correct state-of-charge to Windows, charge termination triggered cleanly at 8.7V, and low-voltage cutoff held at 6.0V without a premature trip.
• First-cycle fuel gauge calibration: After installing, run one complete play session to automatic cutoff before plugging in. The Legion Go's fuel gauge IC sets its empty reference point against the first full discharge cycle on the new cell — skipping this step causes the battery percentage to jump or read inaccurately for several sessions.

Why the Legion Go's battery percentage jumps around after a cell swap

The Legion Go uses a coulomb-counting fuel gauge IC that builds its discharge model from learned cycle data. When a new cell goes in, the IC still holds the old cell's capacity curve in memory, so percentage readings drift against actual charge state. This typically shows as a sudden jump — say, 40% dropping to 12% without warning. Three to five full charge-discharge cycles overwrite the learned curve with data from the new cell, and the gauge stabilises. If it hasn't settled after five cycles, trigger a manual recalibration by discharging to automatic cutoff and charging uninterrupted to 100%.

Legion Go not charging the replacement pack at full rate

The 8APU1 charge IC applies a conservative current limit when it detects a cell it hasn't previously characterised — this is a factory-level protection behaviour, not a fault. Charging will feel slow on the first one or two cycles because the IC is running a reduced pre-charge phase longer than normal. After the first complete charge cycle, the IC updates its learned parameters and full charge current resumes. If slow charging persists past cycle two, confirm the charger is delivering at least 65W and that the USB-C port is seated fully.