V Tech KidiBuzz Replacement Battery SP605062 3.8V 2500mAh

V Tech KidiBuzz — 3.8V Li-Polymer Replacement Battery (SP605062)

This is a 3.8V, 2500mAh Li-Polymer replacement battery for the V Tech KidiBuzz children's tablet (OEM part SP605062). It fits KidiBuzz units sold under model reference 80-169500. Voltage and capacity match the original cell exactly.

• KidiBuzz and 80-169500 compatibility: Both references point to the same hardware revision. The connector pinout, cell dimensions (60.66 × 50.32 × 6.14mm), and 3.8V nominal voltage rail are identical across the range, so one cell covers both.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the KidiBuzz board. The charge IC accepted the new cell without fault flags, and the BMS reported normal status throughout — no thermal cutoff trips, no communication errors.
• Fuel gauge recalibration after installation: After fitting this battery, run the tablet until it shuts off automatically on low battery, then charge it uninterrupted to 100% without unplugging early. The KidiBuzz fuel gauge IC calibrates against cycle data from the old cell — one full discharge-to-shutoff and uninterrupted recharge resets that calibration against the new cell and clears inaccurate percentage readings.

KidiBuzz shutting down at 15–25% battery remaining

This happens because the KidiBuzz display backlight and WiFi radio draw current simultaneously, which causes a sharper voltage drop than the fuel gauge anticipates. When cell voltage dips below the BMS cutoff threshold under that combined load, the board shuts down even though the gauge still shows charge remaining. The fix is a single full recalibration cycle — discharge to automatic shutoff, then charge to 100% uninterrupted. After that cycle the fuel gauge maps the new cell's actual voltage curve, and the early shutdowns stop.

Battery percentage jumping or frozen on screen after swap

The KidiBuzz fuel gauge IC stores charge-state data tied to the previous cell's capacity history. Drop in a new cell and that stored data no longer matches, so the displayed percentage either jumps erratically or sticks at one number. This is not a faulty battery — it is a calibration mismatch. Run one full discharge to automatic shutoff, then plug in and charge uninterrupted to 100%. The IC resets its reference points against the new 2500mAh cell and the percentage display stabilises.