About this replacement
Samsung Galaxy Tab S7 Plus 12.4 — 3.85V Li-Polymer Replacement Battery (EB-BT975ABY)
This is a 3.85V, 9800mAh Li-Polymer replacement battery for the Samsung Galaxy Tab S7 Plus 12.4. It fits SM-T970 and SM-T975 variants, including the 2020 Galaxy Tab S7+ 12.4. It uses the OEM part number EB-BT975ABY and slots into the same battery bay as the original cell.
- SM-T970 and SM-T975 compatibility: Both model numbers share the same chassis dimensions, connector pinout, and BMS handshake protocol — which is why a single cell covers the Wi-Fi and LTE variants without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an SM-T975 unit. The BMS negotiated correctly with the charge IC, protection circuits tripped at expected voltage thresholds, and the cell held capacity across repeated cycles without fault codes.
- Post-swap fuel gauge reset: After installing this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. The Galaxy Tab S7 Plus fuel gauge IC was calibrated to the old cell — skipping this cycle leaves the percentage readout inaccurate for weeks.
Why the Galaxy Tab S7 Plus shuts down at 15–25% after a battery swap
The shutdown happens because the fuel gauge IC still holds calibration data from the degraded original cell. When the new cell's actual voltage profile diverges from that stored map, the IC misreads remaining capacity and signals a low-battery cutoff early. Running the display at full brightness alongside Wi-Fi amplifies the voltage sag, which triggers the cutoff sooner than the percentage would suggest. One complete discharge-to-shutoff and uninterrupted recharge cycle overwrites the old calibration data and resolves this.
Fast charging not available on the Tab S7 Plus after battery replacement
Samsung's 45W Super Fast Charging on this tablet requires the charge IC to complete a successful USB-PD handshake with the charger — and that negotiation resets when the battery is swapped. On the first charge after installation, the system often defaults to standard charging while it re-evaluates the new cell's internal resistance and capacity baseline. Plug in with the original Samsung 45W adapter and allow one full uninterrupted charge cycle to complete. After that cycle, USB-PD negotiation resumes normally and fast charge becomes available again.