About this replacement
Samsung Galaxy Tab 8.9 — 3.7V Li-Polymer Replacement Battery (SP368487A)
This is a 3.7V, 6100mAh Li-Polymer replacement battery for the Samsung Galaxy Tab 8.9. It fits the GT-P7300, GT-P7310, and GT-P7320 variants. Swap it in when the original cell no longer holds a usable charge or fails to power the tablet past the boot screen.
- GT-P7300, GT-P7310, GT-P7320 compatibility: All three variants share the same battery bay dimensions, connector pinout, and charge IC communication protocol — one cell fits the full range without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the GT-P7300. The BMS held charge termination correctly at 4.2V and low-voltage cutoff triggered cleanly before cell damage thresholds were reached.
- Fuel gauge recalibration after install: After fitting this battery, run the tablet down to automatic shutoff — do not force-power-off — then charge uninterrupted to 100% without unplugging. This gives the fuel gauge IC a full reference cycle against the new cell and clears the inaccurate percentage readings that appear immediately post-swap.
Tablet shutting down at 15–25% remaining after battery replacement
The Galaxy Tab 8.9 pulls significant current when the display is at full brightness with Wi-Fi active. A new cell whose fuel gauge IC has not been calibrated will report a higher state-of-charge than the actual cell voltage supports under that load. The processor sees a sudden voltage drop below the cutoff threshold and shuts down before the reported percentage reaches zero. One full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% corrects the gauge reference and eliminates these premature shutoffs.
Fast charging not available after fitting the SP368487A
The Tab 8.9 charge controller uses a handshake with the battery's protection circuit during the first accepted charge cycle to confirm cell parameters before enabling higher charge rates. If the first charge after installation was interrupted — cable pulled, tablet restarted, or power lost — the handshake completes only partially. Connect the tablet to its original charger, allow one full uninterrupted charge from any charge level to 100%, and fast charge availability will restore at the next session.