About this replacement
Acer Aspire R3 Series — 15.2V Li-ion Replacement Battery (AC14B3K)
This is a 15.2V, 3200mAh (48.64Wh) Li-ion replacement battery for the Acer Aspire R3 and Aspire R3-131T notebook series. It replaces OEM part numbers AC14B3K and KT.00403.032. If your original cell has degraded or won't hold a charge, this unit restores the laptop's portable operation.
- Aspire R3 and R3-131T compatibility: These models share the same 15.2V four-cell architecture, connector pinout, and BMS communication protocol. The same cell works across the R3-131T-P4QQ and R5 variants because Acer kept the voltage rail and EEPROM handshake consistent across that generation.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an Aspire R3-131T. The BMS negotiated correctly with the motherboard, charge acceptance was normal from the first cycle, and the protection circuit tripped as expected at the low-voltage cutoff threshold.
- Post-install calibration on the Aspire R3: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The Aspire R3's fuel gauge IC recalibrates against the new cell's actual capacity. Skipping this step causes the BIOS to report inaccurate health warnings for weeks.
BIOS reporting poor battery health immediately after fitting the new cell
The Aspire R3 stores battery health data in EEPROM on the motherboard. When you swap cells, that stored data reflects the old, degraded battery — not the new one. Windows and the Acer BIOS will both flag poor health until the learn cycle is completed. Run a full discharge to hibernate, then a full uninterrupted charge. After two to three cycles the BIOS recalculates from actual cell data and the warning clears.
Aspire R3 shutting down at 20–30% charge shown on screen
This is a voltage cliff symptom. Under full CPU and display load, the cell voltage drops sharply below the BMS cutoff threshold while the fuel gauge still reads 20–30%. It usually means the fuel gauge IC hasn't yet calibrated its discharge curve to the new cell. Complete two full discharge-to-hibernate cycles. If the shutdowns continue after calibration, check the battery voltage under load with a multimeter — a healthy cell at 20% charge should hold above 14.8V.