About this replacement
Asus Chromebook Flip C101PA Series — 7.7V Li-Polymer Replacement Battery (C21N1627)
This is a 7.7V, 4850mAh (37.35Wh) Li-Polymer replacement battery for the Asus Chromebook Flip C101PA-DS04 and related C101PA variants. It replaces OEM part numbers C21N1627 and 0B200-02460000. If your Chromebook no longer holds a charge or powers off unexpectedly, this cell restores full portability to the device.
- C101PA series compatibility: The DS04, DB02, and OP1 variants of the C101PA all share the same battery bay geometry, connector orientation, and 7.7V supply rail — which is why one cell covers the full lineup without modification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the C101PA platform and confirmed the BMS communicates correctly with ChromeOS — charge state reported accurately and no overcurrent flags were triggered during high-brightness, active-tab load.
- Post-install calibration on the C101PA: After fitting this cell, run the Chromebook down until ChromeOS hibernates on its own, then charge uninterrupted to 100% without interruption. This forces the fuel gauge IC to re-learn the new cell's capacity curve and clears the false "battery health poor" warning that appears in ChromeOS diagnostics after a cell swap.
ChromeOS diagnostics flagging poor battery health after replacement
The ChromeOS Battery app and crosh battery_test command read health data cached in the fuel gauge IC's EEPROM — data written against the original cell. When a new cell goes in, that cached data doesn't match the new chemistry profile, so ChromeOS reports low health or a degraded Wh rating even on a brand-new cell. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the fuel gauge IC to rewrite its learned parameters. After one or two full cycles, the health percentage and Wh figure in diagnostics will align with the actual cell capacity of 37.35Wh.
Chromebook shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC hasn't calibrated against the new cell yet — the percentage shown doesn't reflect actual state of charge, and the cell hits its minimum voltage threshold before the gauge reaches zero. Under combined CPU and display load on the C101PA, the voltage drops faster than the uncalibrated gauge predicts, triggering an emergency shutdown. The fix is the same calibration cycle: discharge fully to hibernate, then charge to 100% without interruption. After two full cycles the gauge tracks accurately and shutdowns at false high-percentage readings stop.