About this replacement
Asus Transformer Book T100 Chi — 3.8V Li-Polymer Replacement Battery (C12N1419)
This is a 3.8V, 7850mAh Li-Polymer replacement battery for the Asus Transformer Book T100 Chi detachable tablet. It fits the tablet portion of the T100 Chi and T100CHI-FG003B, replacing part number C12N1419 or 0B200-01300200. At 29.83Wh, it matches the original cell specification for the T100 Chi tablet chassis.
- T100 Chi tablet compatibility: The T100 Chi uses a slim 2.60mm cell profile that sits flush behind the tablet display panel. Both listed OEM part numbers — C12N1419 and 0B200-01300200 — reference the same cell and connector configuration in this tablet, so either number confirms the correct fit.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the T100 Chi platform. The BMS accepted the cell without fault flags, charge termination triggered correctly at full voltage, and the charge IC cycled without thermal events.
- Fuel gauge recalibration after swap: After fitting this battery, run the tablet down to automatic shutoff, then charge uninterrupted to 100% without interruption. This single full cycle resets the fuel gauge IC calibration against the new cell and clears the inaccurate percentage readings that appear immediately after a swap.
Why the T100 Chi shuts down at 15–25% battery remaining
The T100 Chi's fuel gauge IC stores a charge map calibrated to the original cell. When a new cell goes in, that map is stale. The tablet reads voltage and calculates remaining charge using old curve data, which causes it to call an early shutdown well before the cell is actually empty. Running one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% forces the fuel gauge IC to re-learn the new cell's voltage curve. After that single cycle, the shutoff threshold moves back to its correct low-voltage point near 3.0V per cell.
Fast charging not available on the T100 Chi after battery replacement
The T100 Chi's charge controller validates the battery state before enabling higher charge rates. On a freshly installed cell with no charge history, the controller defaults to a lower conditioning current until it completes one accepted charge cycle. Plug into the original Asus adapter — third-party chargers that don't negotiate the correct voltage profile will stay in slow-charge mode regardless of cycle count. After one full charge cycle on the correct adapter, the controller enables the standard charge rate for the T100 Chi platform.