Nintendo Wii U GamePad WUP-001 Replacement Battery 3.7V 3200mAh

Nintendo Wii U GamePad — 3.7V Li-ion Replacement Battery (WUP-001)

This 3.7V, 3200mAh Li-ion battery replaces the original cell in the Nintendo Wii U GamePad WUP-001. The GamePad is the primary controller for the Wii U console — it handles wireless communication, touch input, and the built-in screen simultaneously. All three draw from this single cell.

• Wii U GamePad WUP-001 fit: The GamePad uses a fixed battery bay with a specific connector orientation and a BMS that communicates state-of-charge data back to the console. This cell matches the voltage rail and connector required for that handshake to function correctly.
• Bench tested on actual hardware: We ran this battery through a full charge cycle on a WUP-001 unit. The BMS accepted the cell without fault codes, charge current stepped down correctly at the top-of-charge threshold, and the console-side battery indicator updated as expected.
• GamePad screen and wireless load tip: The GamePad streams video from the console over Wi-Fi while the screen stays active. Avoid suspending the GamePad mid-session for extended periods with the screen on — that state draws continuous current without the console's power management stepping in to reduce it.

Why the Wii U GamePad fuel gauge jumps or reads wrong after a cell swap

The Wii U GamePad uses a fuel gauge IC that tracks charge by measuring cumulative current flow over time. When you swap the physical cell, the IC still holds discharge curve data from the old battery. The mismatch between that stored curve and the new cell's actual characteristics causes the percentage readout to jump, skip, or settle at the wrong value. One complete discharge cycle — from full charge down to automatic cutoff — gives the IC enough data to recalibrate against the new cell and stabilise the readout.

GamePad not charging at full rate after battery replacement

The Wii U charge IC applies a conservative current limit when it detects a cell it hasn't previously profiled — this is a protection behaviour, not a fault. Charge current stays reduced until the IC completes one full charge cycle and confirms the cell accepts voltage within expected parameters. After that first cycle, the IC releases the limit and charges at the normal rate. If reduced charge rate persists beyond two full cycles, check that the battery connector is fully seated and the terminal contacts are clean.