BQ E10 Tablet Replacement Battery 3.8V 8600mAh Li-Polymer

BQ E10 Tablet — 3.8V Li-Polymer Replacement Battery (8680)

This is a 3.8V, 8600mAh Li-Polymer replacement battery for the BQ E10 tablet (Part No 8680). It fits the E10 directly and restores full power to the device when the original cell has degraded or failed entirely. Capacity figures are taken from the product specification — 32.68Wh total energy.

• E10 tablet fitment: The BQ E10 uses a single large-format Li-Polymer pouch cell running at 3.8V nominal. This replacement matches that voltage rail, physical footprint (172.10 × 124.10 × 3.00mm), and connector pinout, so the tablet's charge IC and BMS can communicate with the cell correctly.
• Bench tested on actual hardware: We ran the cell through charge and discharge cycles on the bench. The BMS held the 3.8V nominal rail cleanly, charge termination triggered correctly at full capacity, and the protection circuit responded to simulated over-discharge conditions as expected.
• Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff — do not force-shutdown — then charge it uninterrupted to 100% before use. This single full cycle lets the fuel gauge IC re-calibrate against the new cell's actual capacity curve and corrects the inaccurate percentage readings that almost always appear immediately after a battery replacement.

BQ E10 shutting down at 15–25% battery remaining

This happens because the fuel gauge IC was calibrated to the old, degraded cell. When you install a new cell, the gauge still uses the old discharge curve, so it reads the voltage incorrectly and triggers a low-battery shutdown well before the cell is actually flat. The combined load of the display at full brightness and an active Wi-Fi connection draws enough current to cause a sharp voltage sag — the system interprets this sag as a dangerously low state of charge. Run one complete discharge to automatic shutoff, then charge uninterrupted to 100%. After that single cycle, the gauge recalibrates and the early shutdowns stop.

Fast charging not available on the BQ E10 after battery replacement

The BQ E10's charge IC uses a handshake with the charger to enable fast or USB-PD charging. Immediately after a battery swap, the system sometimes falls back to standard charging rates until it has completed at least one full accepted charge cycle with the new cell. This is a firmware-level behaviour, not a fault with the replacement battery. Plug in the original BQ charger — not a third-party cable — let it charge to 100% without interruption, then disconnect and reconnect. Fast charging should re-engage on the next connection.