About this replacement
Samsung Galaxy Tab S 10.5 — 3.8V Li-Polymer Replacement Battery (EB-BT800FBE)
This is a 3.8V, 7900mAh Li-Polymer replacement battery for the Samsung Galaxy Tab S 10.5-inch tablet. It fits the SM-T800, SM-T801, and SM-T805 variants. Install it when the original EB-BT800FBE has degraded, swells, or no longer holds a usable charge.
- SM-T800, SM-T801, SM-T805 compatibility: All three share the same 3.8V battery rail, the same EB-BT800FBE connector pinout, and the same charge IC handshake — so one cell fits the Wi-Fi, LTE, and regional variants across this Tab S 10.5 generation.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on an SM-T800 unit. The BMS accepted the charge IC handshake without fault flags, and voltage held steady across display-on and processor-load states.
- Fuel gauge recalibration after swap: After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without using the device. This gives the fuel gauge IC a full reference cycle against the new cell and clears the inaccurate percentage readings that typically appear after a battery swap.
Why the Galaxy Tab S 10.5 shuts down between 15–25% remaining
The Tab S 10.5 runs a 2560×1600 display alongside Wi-Fi and background sync — a combined load that draws hard on the cell at low state of charge. When cell voltage drops under that combined load, it hits the BMS low-voltage cutoff faster than the fuel gauge predicts. The result looks like a sudden shutdown even though the percentage counter hasn't reached zero. One full recalibration cycle — discharge to shutoff, uninterrupted charge to 100% — resets the fuel gauge reference and resolves most of these early cutoffs.
Fast charging unavailable after battery replacement
Samsung's adaptive fast charge protocol requires a successful completed charge cycle before the charge IC fully negotiates with a new cell. If fast charging doesn't appear in the battery settings after installation, that's expected behaviour — not a fault. Plug in using the original Samsung adaptive charger and let the tablet complete one full charge to 100% without interruption. After that cycle, fast charge negotiation resumes normally and the option reappears in settings.