About this replacement
Samsung Galaxy Tab S5e — 3.85V Li-Polymer Replacement Battery (EB-BT725ABU)
This is a 3.85V, 6800mAh Li-Polymer replacement battery for the Samsung Galaxy Tab S5e 10.5 (2019), covering SM-T720 and related variants. It fits the original cell slot directly, using the same OEM part number EB-BT725ABU. If your Tab S5e no longer holds a charge or powers on reliably, this replaces the degraded cell.
- SM-T720 and SM-T725 variant coverage: Both the Wi-Fi (SM-T720) and LTE (SM-T725) Tab S5e models share the same battery connector, voltage rail, and BMS handshake protocol — this cell works across the full S5e lineup without modification.
- Bench tested on actual hardware: We cycled this cell through the Tab S5e charge IC and confirmed BMS communication, thermal sensor registration, and charge acceptance at the correct 4.40V upper cutoff. No false full-charge flags on either the Wi-Fi or LTE board.
- Fuel gauge recalibration after swap: The Tab S5e uses a dedicated fuel gauge IC that calibrates to the previous cell's internal resistance profile. After installation, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. This resets the IC against the new cell and eliminates inaccurate percentage readings.
Why the Tab S5e shuts down at 15–25% after a battery swap
The fuel gauge IC on the SM-T720 board was calibrated to the resistance curve of the old, degraded cell. A new cell has lower internal resistance, so the IC underestimates remaining capacity at moderate load. When the display backlight and Wi-Fi radio draw current together, the reported voltage drops faster than the gauge expects, triggering a low-voltage shutdown before the cell is genuinely depleted. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% realigns the IC to the new cell's actual curve.
Fast charging not available on the Tab S5e after battery replacement
Samsung's Adaptive Fast Charging on the Tab S5e requires the charge IC to complete at least one full accepted charge cycle before it unlocks higher current delivery. Immediately after a swap, the tablet defaults to standard 5V charging while the IC verifies the new cell accepts voltage correctly. This is a protective hold, not a fault. Charge the tablet fully once using the original Samsung charger and cable — fast charging typically re-enables on the next charge session.