About this replacement
Samsung Galaxy Tab S7 11.0 / SM-T870 — 3.86V Li-Polymer Replacement Battery (EB-BT875ABY)
This 3.86V, 7760mAh Li-Polymer battery replaces the original cell in the Samsung Galaxy Tab S7 11.0 and its regional variants — SM-T870, SM-T875N, and SM-T878U. It fits where the OEM part EB-BT875ABY or GH43-05028A was originally installed. Use it when the tablet no longer holds a charge, shuts off unexpectedly, or won't power on past the boot screen.
- Tab S7 variant coverage: SM-T870, SM-T875N, SM-T878U, and the Galaxy Tab S7 11.0 all share the same 7760mAh cell format, connector pinout, and BMS handshake protocol — that's why one part number covers the full lineup.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the SM-T870 platform. The BMS negotiated correctly with Samsung's charge IC, voltage stayed within spec at load, and no thermal flags triggered during a full charge cycle.
- Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using the device. This forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and clears the inaccurate percentage readings that commonly appear after a battery replacement.
Tab S7 shutting down at 15–25% remaining battery
The Galaxy Tab S7's display draws significant power at high brightness, and when Wi-Fi is active and syncing simultaneously, the combined load creates a sharp voltage dip. If the fuel gauge IC hasn't mapped the new cell correctly, it misreads that voltage cliff as near-empty and triggers a shutdown — even when real capacity remains. The BMS protects the cell by cutting output the moment terminal voltage drops below its threshold under that combined draw. Running one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% resets the gauge and pushes the shutdown point back down where it belongs.
Fast charging unavailable after battery replacement on SM-T870
USB-PD and Samsung's Adaptive Fast Charge protocol require the charge controller to complete at least one full accepted charge cycle before the device re-enables high-wattage charging. After a swap, the tablet often defaults to standard 5V charging for the first cycle as a safety measure — this isn't a fault with the battery or the charger. Plug in the original Samsung charger and let it complete one full charge from low to 100% without interruption. Fast charge should re-enable automatically on the next connection once the protocol handshake clears.