Toshiba Excite A204 Replacement Battery 3.75V 5100mAh

Toshiba Excite A204 — 3.75V Li-Polymer Replacement Battery (PA5218U-1BRS)

This 3.75V, 5100mAh Li-Polymer battery replaces the original PA5218U-1BRS cell in the Toshiba Excite A204 and Excite A204 AT10-B tablets. It restores power when the original cell degrades, swells, or no longer holds a charge. Voltage and capacity match the OEM spec exactly.

• Excite A204 and AT10-B compatibility: Both the A204 and AT10-B variants share the same battery bay dimensions, connector pinout, and BMS communication protocol — that is why one cell covers both. The same fuel gauge IC handles state-of-charge reporting across the two board revisions.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the A204 motherboard. The BMS accepted the cell without error codes, charge IC handshake completed normally, and the fuel gauge IC began calibrating against the new cell within the first cycle.
• Fuel gauge reset after installation: After fitting this battery, run one full discharge to automatic shutoff — do not force it off — then charge uninterrupted to 100%. This gives the fuel gauge IC a fixed reference point on the new cell and clears the inaccurate percentage readings that appear immediately after a swap.

Toshiba Excite A204 shutting down at 15–25% remaining

This is a voltage cliff issue, not a defective cell. Under combined display brightness and active WiFi load, the tablet draws enough current to cause a rapid voltage sag below the BMS cutoff threshold — even when the fuel gauge still reads 15–25%. The old cell's discharge curve is stored in the fuel gauge IC, and the new cell has a slightly different curve until recalibration runs. One full discharge-to-shutoff followed by a full charge corrects the curve mismatch and pushes the reported cutoff point back to where it belongs.

Fast charging not available after battery swap on the Excite A204

The charge IC on the A204 uses a negotiation sequence during the first accepted charge cycle to confirm the new cell's parameters before enabling higher charge rates. If fast charging is absent immediately after installation, this is expected — it is not a fault with the battery or the charger. Connect the original OEM charger and allow one complete charge cycle from low to 100% without interruption. After that cycle completes, the charge IC unlocks the higher rate and fast charging resumes normally.