About this replacement
Asus Business P1701FA Series — 11.49V Li-Polymer Replacement Battery (C31N1907)
This is an 11.49V, 4050mAh (46.53Wh) lithium-polymer battery for the Asus Business P1701FA-AU657 and related P1701 series notebooks. It replaces OEM part numbers C31N1907 and 0B200-03350600. The P1701DA and P1701FA share this same battery platform, so one SKU covers all four listed models.
- P1701 platform compatibility: The P1701DA and P1701FA lines run the same 11.49V three-cell architecture with an identical connector pinout and BMS handshake protocol. Asus kept this battery consistent across both CPU variants, so the same physical cell fits without modification.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on P1701-class hardware. The BMS negotiated correctly at full charge, held the 11.49V rail under combined CPU and display load, and triggered low-voltage cutoff cleanly without premature shutdown.
- Post-swap calibration on the P1701: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor after fitting this cell
Asus laptops store battery health data in EEPROM on the old cell. When a new cell is fitted, the BIOS reads no accumulated cycle history and flags the battery as unknown or poor condition. This is not a fault with the replacement. The BIOS needs at least one complete charge-discharge-recharge cycle to write fresh baseline data to the new cell's EEPROM. After that cycle completes, the health status clears and reports correctly in MyASUS and the Windows power settings panel.
P1701 shutting 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 capacity curve. The OS is reading state-of-charge from an uncalibrated model and calling shutdown before the cell is truly depleted. It is not a defective cell — it is a calibration lag. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After those cycles, the fuel gauge re-anchors its empty endpoint and the displayed percentage tracks the actual remaining capacity accurately down to roughly 11.2V at cutoff.