About this replacement
Samsung Galaxy Tab Pro 8.2 — 3.8V Li-Polymer Replacement Battery (AAaD828oS/T-B)
This is a 3.8V, 6600mAh (25.08Wh) Li-Polymer battery for the Samsung Galaxy Tab Pro 8.2 (GT-P8220 / GT-P8220E). It replaces the original cell when capacity fade has made the tablet unreliable for media, productivity, or general use. Fits the 8.2-inch Android tablet form factor with the stock connector and dimensions.
- GT-P8220 and GT-P8220E compatibility: Both variants use the same 3.8V Li-Polymer cell, connector pinout, and BMS communication protocol — the hardware is identical between the two and this battery works across both without modification.
- Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the GT-P8220 platform. The BMS handshake completed on first connection, charge IC accepted the cell without fault flags, and the tablet booted normally through Android.
- Fuel gauge reset after installation: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. The fuel gauge IC calibrates against the new cell during that first full cycle — skipping it leaves the percentage readout misaligned with actual capacity.
Tablet shutting down at 15–25% remaining after battery swap
This happens because the fuel gauge IC is still calibrated to the curve of the old, degraded cell. When the new cell hits a voltage point the IC wasn't expecting, it triggers an early low-battery shutdown. The display and WiFi together draw enough current to cause a short voltage sag that crosses the cutoff threshold before the real capacity is exhausted. Run one full discharge to automatic shutoff followed by an uninterrupted charge to 100% — after that cycle the IC recalibrates and shutdowns at 15–25% stop.
Fast charging not available after replacing the GT-P8220 battery
Samsung's charge IC on the Tab Pro 8.2 runs a handshake with the battery's BMS before enabling higher charge rates. On a freshly installed cell, that negotiation sometimes completes only after the first full accepted charge cycle. If fast charge remains unavailable, confirm the charger is the original Samsung adaptive charger — third-party USB adapters often lack the voltage signalling required for the protocol. After one full cycle with the correct charger, the charge rate should return to normal.