About this replacement
Samsung Galaxy Tab S3 9.7 — 3.8V Li-Polymer Replacement Battery (EB-BT825ABE)
This is a 3.8V, 6000mAh lithium-polymer cell replacing the internal battery in the Samsung Galaxy Tab S3 9.7 and Tab S3 9.7 XLTE. It fits SM-T820, SM-T827V, and related variants that share the EB-BT825ABE battery specification. Capacity is 22.8Wh — matching the original cell's energy rating.
- SM-T820 and SM-T827V platform fit: These models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The 165.90 × 116.12 × 2.92mm cell format fits flush without modification, and the BMS communicates charge state correctly to the system IC on first boot.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on SM-T820 hardware. The BMS accepted the new cell without fault flags, charge current ramped correctly through CC/CV phases, and the system reported state-of-charge without error prompts.
- Fuel gauge recalibration after swap: After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the fuel gauge IC calibration against the new cell and clears the inaccurate percentage readings that commonly appear after a battery replacement.
Tablet shutting down at 15–25% remaining after battery swap
The Tab S3's power management IC learned the voltage discharge curve of the original degraded cell over months of use. When a new cell is installed, that stored curve no longer matches actual cell behaviour at low charge states. At around 3.6–3.65V, the display backlight and active WiFi pull combined current that drops apparent voltage below the old cutoff threshold the IC still references. The fix is one full recalibration cycle — drain to forced shutoff, then charge to 100% without interruption — so the IC maps the new cell's actual voltage floor.
Fast charging not resuming after battery replacement
Samsung's adaptive fast charge protocol requires the charge IC to complete at least one accepted charge handshake with the new cell before it enables higher current delivery. If fast charge shows as unavailable immediately after a swap, the IC is still running in standard mode. Connect the original Samsung fast charger and allow one full charge cycle to complete without interruption. After that cycle, fast charge negotiation resumes at the correct current rate.