About this replacement
Acer Aspire V5-122P — 11.4V Li-ion Replacement Battery (AC13C34)
This is an 11.4V, 2640mAh (30.1Wh) Li-ion battery for the Acer Aspire V5-122P and related models including the Aspire E3-111 and E3-112 series. It matches the OEM part numbers AC13C34, KT.00303.005, and 3ICP5/60/80. Install it when the original cell no longer holds a charge or the laptop fails to run on battery power.
- Aspire V5-122P and E3 series compatibility: These models share the same 11.4V three-cell architecture, connector pinout, and BMS handshake protocol — the same replacement cell works across all of them without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an Aspire V5-122P unit. The BMS negotiated correctly with the BIOS, charge current tapered normally at capacity, and no protection trips occurred during load testing.
- First-cycle calibration on the V5-122P: After fitting this cell, run the laptop on battery until it hibernates at low charge, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after swap on the V5-122P
The Aspire V5-122P stores battery health data in EEPROM on the old cell. When a new cell is fitted, the BIOS reads stale cycle count and degradation flags from that stored data and flags the replacement as faulty. This is not a defect in the new battery. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — this forces the BIOS to write a fresh baseline and the health warning clears.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 25% remaining, but the cell voltage has already dropped below the threshold that sustains CPU and display load simultaneously. The laptop cuts power to protect the cell before the OS reaches the shutdown trigger. Run two or three full discharge-to-hibernate and full charge cycles — the fuel gauge IC recalibrates against real cell behaviour and the early shutdowns stop.