About this replacement
Acer Iconia B1-A71 — 3.7V Li-Polymer Replacement Battery (BAT-715)
This is a 3.7V, 1800mAh Li-Polymer cell for the Acer Iconia Tab A1-810 7-inch Android tablet. It fits the B1-A71, Iconia B1-A71, and Iconia B1-A71-83174G00nk variants. Capacity is 6.66Wh, matching the original BAT-715 specification.
- B1-A71 series compatibility: These models share the same flat Li-Polymer cell format, connector pinout, and charge IC handshake. The BMS negotiates with the same Acer charge controller across all B1-A71 board revisions, so one cell covers the full line.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a B1-A71 board. The BMS accepted the cell without error flags, the charge IC stepped through constant-current and constant-voltage phases correctly, and protection cutoff triggered at the expected low-voltage threshold.
- Fuel gauge recalibration after swap: After fitting this cell, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. This forces the fuel gauge IC to map its cutoff points against the new cell and clears the percentage drift that almost always appears after a battery swap on this model.
Acer Iconia B1-A71 shutting down at 15–25% remaining
The B1-A71 shuts down early when the fuel gauge IC still holds calibration data from the old degraded cell. The new cell's voltage curve doesn't match those stored values, so the IC miscalculates the low-voltage floor and trips a premature cutoff. Running one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% rewrites the calibration registers. After that cycle, the tablet should reach genuine 0% before cutting power.
Acer Iconia B1-A71 showing wrong battery percentage after replacement
The percentage display is driven by a fuel gauge IC that tracks charge state against the old cell's internal resistance profile. Swap the cell and those stored values are immediately wrong, which produces jumpy or stuck percentage readings. The fix is a single full cycle: discharge to automatic shutoff, then charge to 100% without interruption. Once complete, the gauge reads against the new cell's actual curve and the percentage stabilises.