Acer Iconia One 10 B3-A20 Compatible Battery 3.7V 5700mAh

Acer Iconia One 10 B3-A20 — 3.7V Li-Polymer Replacement Battery (PR-279594N)

This is a 3.7V, 5700mAh (21.09Wh) lithium-polymer battery for the Acer Iconia One 10 B3-A20 10-inch Android tablet. It also fits the Iconia Tab 10 A3-A40, the A5008, and the Iconia One 10 B3-A30, among other models sharing the same cell footprint. OEM part numbers covered include PR-279594N, PR-279594N(1ICP3/95/94-2), and KT.0020H.002.

• Cross-model fit on the B3 and A3 platform: These Acer Iconia tablets share the same 188.50 x 99.60 x 3.20mm cell envelope, 3.7V rail, and connector pinout. The BMS handshake is consistent across this lineup, so the same cell works across all listed variants without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the B3-A20 board. The BMS accepted the cell immediately, balancing charge current correctly and triggering protection cutoff at the expected low-voltage threshold.
• Fuel gauge recalibration after install: After fitting this battery, run the tablet down to automatic shutoff — do not force-power it off — then charge it uninterrupted to 100%. This single full cycle resets the fuel gauge IC against the new cell's actual capacity and clears the inaccurate percentage readings that commonly appear after a swap.

Tablet shutting down at 15–25% remaining after battery replacement

This happens because the fuel gauge IC was calibrated to the old, degraded cell. When a new cell with full capacity is installed, the IC's state-of-charge map no longer matches the actual voltage curve. The tablet interprets a voltage drop under combined display and Wi-Fi load as a critically low charge — and shuts down. One complete discharge-to-shutoff followed by an uninterrupted charge to 100% realigns the gauge. After that cycle, reported percentage tracks actual cell voltage correctly.

Android reporting wrong battery percentage after the swap

The percentage shown in Android pulls from the fuel gauge IC, not the cell directly. That IC holds learned data from the original battery — cell impedance, capacity endpoints, and voltage-to-percentage mapping. A new cell has different characteristics, so the old data produces inaccurate readings right away. Drain the tablet fully until it powers off on its own, then charge to 100% without interruption. That recalibration cycle writes fresh endpoint data to the gauge and corrects the display.