Nextbook Ares 10A Replacement Battery 3.7V 4200mAh

Nextbook Ares 10A / NX16A10132SPS — 3.7V Li-Polymer Replacement Battery (AE2560117P8H)

This 3.7V, 4200mAh lithium-polymer battery replaces part number AE2560117P8H in the Nextbook Ares 10A and NX16A10132SPS tablets. It fits the slim 120 × 116 × 2.50mm cell bay and connects to the same charge IC and fuel gauge found in both models. Capacity figures come from the product data — 15.54Wh at 3.7V nominal.

• Ares 10A and NX16A10132SPS shared platform: Both models run the same battery rail, connector pinout, and BMS handshake, so a single cell covers the pair. The charge IC communicates state-of-charge data over the same two-wire interface on both units.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Ares 10A platform. The BMS accepted the cell without fault flags, balanced correctly across the protection circuit, and the charge IC reached full cutoff cleanly at the expected voltage ceiling.
• Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without interruption. This forces the fuel gauge IC to map its empty and full reference points against the new cell and clears the inaccurate percentage readouts that commonly appear on first boot after a swap.

Ares 10A shutting down at 15–25% remaining after battery swap

This happens because the fuel gauge IC still holds calibration data from the old, degraded cell. It maps the voltage curve incorrectly and triggers a low-battery shutdown well before the new cell is actually empty. The combined load of the display backlight and active Wi-Fi creates a current draw spike that pulls cell voltage below the protection threshold faster than the gauge expects. Run one full discharge to automatic shutoff followed by an uninterrupted charge to 100% — that single cycle resets the reference points and the premature shutdown stops.

Battery percentage jumping or reading 0% on first boot after installation

On first power-up with a new cell, the Android battery service reads the fuel gauge IC's stored data, which still reflects the old battery's state. If the old cell died at a low state of charge, the gauge may report 0% or an unstable number even though the new cell has charge in it. This is a gauge memory issue, not a cell fault. Plug the tablet into the charger immediately — once the charge IC begins a valid charge cycle, the gauge re-anchors to the new cell's voltage curve and the percentage stabilises within a few minutes.