About this replacement
Nintendo Wii U GamePad — 3.7V Li-Polymer Replacement Battery (WUP-012)
This 3.7V, 1500mAh lithium-polymer cell replaces the original battery in the Nintendo Wii U GamePad (WUP-010). It fits the WUP-012 battery slot directly and restores power to the wireless controller when the original cell no longer holds a usable charge. Dimensions are 65.25 × 52.58 × 9.84mm — confirm your original cell matches before installing.
- WUP-010 GamePad compatibility: The Wii U GamePad runs a single-cell Li-Polymer pack at 3.7V nominal. The WUP-012 part number covers the full WUP-010 controller line — the connector orientation, cell footprint, and BMS voltage thresholds are consistent across the range.
- Bench tested on actual hardware: We cycled this cell on a WUP-010 unit and monitored BMS charge acceptance and cutoff voltage. The protection circuit engaged correctly at both the low-voltage floor and the 4.2V charge ceiling with no anomalies across three full cycles.
- First-cycle fuel gauge calibration: After installing, run one complete wireless play session to automatic controller cutoff before recharging. The Wii U GamePad's fuel gauge IC sets its empty reference point against the first full discharge — skipping this step can cause the battery indicator to read inaccurately for weeks.
Why the Wii U GamePad battery indicator jumps around after a cell swap
The GamePad uses a coulomb-counting fuel gauge IC that tracks charge in and out of the cell. When you swap cells, the IC carries over its old learned capacity model, which no longer matches the new cell's discharge curve. This mismatch causes the battery percentage to skip, jump forward, or drop suddenly — especially in the 40–20% range. Three to five full discharge-and-recharge cycles reset the learned model and bring the indicator back into alignment.
GamePad drops wireless connection before the battery indicator reaches empty
This happens when the cell's voltage sags under combined wireless radio and rumble motor load. The GamePad's wireless chipset has a tighter minimum voltage floor than the low-battery indicator threshold — so the radio cuts out first, before the fuel gauge shows empty. A cell that has aged past 70% of rated capacity will sag enough under this load to trip the radio cutoff even at 30% indicated charge. Installing a fresh 1500mAh cell restores the voltage headroom and eliminates the dropout — confirm the connection holds at full brightness and rumble enabled before closing the controller.