About this replacement
Samsung Galaxy Tab 3 SM-T310 / SM-T311 — 3.7V Li-Polymer Replacement Battery (SP3379D1H)
This 3.7V, 3000mAh Li-Polymer battery replaces part number SP3379D1H in the Samsung Galaxy Tab 3 series. It fits the SM-T310 and SM-T311 tablets, along with six additional Tab 3 variants that share the same connector and cell format. Swap it in when the original cell no longer holds charge or the tablet shuts down unexpectedly under load.
- SM-T310 and SM-T311 compatibility: These two models share the same battery bay dimensions, JST connector pinout, and BMS communication protocol — one cell fits both without modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a Tab 3 unit. The BMS accepted the new cell without error, and the charge IC behaved normally across all states.
- Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff — do not force a restart — then charge uninterrupted to 100%. The fuel gauge IC calibrates against the new cell during this cycle. Skip it and the percentage display may read incorrectly for weeks.
Why the Tab 3 shuts down at 15–25% after a battery replacement
The Tab 3's fuel gauge IC stores discharge curve data from the original cell. A new cell has a slightly different voltage-to-capacity curve at the low end. When the tablet draws combined load — display at full brightness plus active Wi-Fi — the real voltage dips below the old shutdown threshold before the gauge registers empty. The tablet cuts power while the percentage still shows double digits. One full discharge-to-shutoff cycle followed by a complete charge retrains the gauge against the actual curve of the new cell and stops this from happening.
Tablet showing inflated or deflated percentage immediately after installation
The percentage jumping to an unexpected number right after a swap is a gauge drift issue, not a faulty cell. The fuel gauge IC was calibrated to the impedance and self-discharge profile of the old battery. It reads the new cell's resting voltage and maps it to the wrong state-of-charge point. Force-restarting or topping up to 100% without a full discharge first does not fix it. Drain the tablet to automatic shutoff, then charge in one uninterrupted session to 100% — that single cycle resets the calibration.