Sanyo 3UR18650F-2-QC-11 Laptop Compatible Battery 11.1V 4400mAh

Sanyo 3UR18650F-2-QC-11 — 11.1V Li-ion Replacement Battery

This is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for laptops using the Sanyo 3UR18650F-2-QC-11 cell pack. It matches the original voltage and capacity spec. Confirm your OEM part number against your existing battery label before ordering.

• Cell pack compatibility: The 3UR18650F-2-QC-11 designation identifies a three-cell-in-series, two-parallel configuration running an 11.1V nominal rail. Laptops using this pack share a common connector pinout and BMS handshake protocol — voltage tolerance on the sense line is tight, so cell voltage must sit within spec or the host BIOS will flag the pack as unknown.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a laptop platform matching the original spec. The BMS responded correctly at both the low-voltage cutoff and top-of-charge termination points. No false-trip conditions appeared during the test sequence.
• Post-install calibration cycle: After fitting this battery, run the laptop down to hibernate cutoff under normal use — no forced discharge tools needed — then charge uninterrupted to 100%. This gives the BIOS fuel gauge IC a full-range reference against the new cells and clears the inaccurate health warning that appears after almost every cell swap.

Laptop shutting down at 20–30% shown after battery swap

This is a voltage-cliff failure, not a capacity problem. Under full CPU and display load, the new cells are pulled hard enough that terminal voltage drops below the BIOS shutdown threshold before the fuel gauge reads zero. The fuel gauge IC is still using calibration data from the old, degraded pack. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100% — after that the gauge will track the actual voltage curve of the new cells and the early shutdowns will stop.

BIOS showing wrong Wh rating after installing the replacement pack

The Wh value the BIOS displays is read from EEPROM data stored inside the battery pack's own controller, not calculated live from cell chemistry. If the EEPROM on the replacement pack carries a rated-capacity figure that differs from your original, the system info screen will show a mismatch. This does not affect how the battery charges or discharges — the fuel gauge IC manages actual cutoffs independently. Check the physical label: if voltage reads 11.1V and capacity reads 4400mAh, the pack is correct for this application.