About this replacement
Asus Transformer Mini T102HA — 3.85V Li-Polymer Replacement Battery (C12N1607)
This is a 3.85V, 8200mAh (31.57Wh) lithium-polymer replacement battery for the Asus Transformer Mini T102H and T102HA series. It fits the detachable tablet unit directly, replacing OEM part C12N1607 and cross-references 0B200-02230100 and 0B200-02230000. Install it when the original cell no longer holds a charge or causes unexpected shutdowns.
- T102H and T102HA tablet unit: Both share the same battery bay geometry, connector pinout, and BMS handshake protocol. The slim 3.05mm cell profile is specific to this detachable form factor — thicker cells from other Transformer lines will not seat correctly.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a T102HA unit. The BMS completed handshake without fault codes, charge acceptance held at full rated capacity, and the protection circuit triggered correctly at low-voltage cutoff.
- First-cycle calibration on the T102HA: After fitting, run the tablet down to automatic hibernate, then charge uninterrupted to 100% without using the device. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
Why the T102HA shuts down at 20–30% after a battery swap
The Transformer Mini's fuel gauge IC builds its charge map against the previous cell's discharge curve. A new cell has a different voltage-capacity slope, so the gauge underestimates remaining charge and triggers shutdown well before the cell is actually depleted. This is not a fault with the replacement battery — it is a calibration mismatch. Running two full discharge-to-hibernate and uninterrupted-charge cycles forces the IC to relearn the new cell's curve. After those cycles, the reported percentage tracks accurately.
BIOS reporting battery health as poor or unknown immediately after install
The T102HA reads battery health from EEPROM data embedded in the original cell's BMS. A replacement cell ships with its own EEPROM values, which the BIOS has not yet validated — so it flags the battery as unknown or degraded on first boot. This clears after the BIOS completes one full battery learn cycle. Discharge the tablet fully to hibernate, then charge to 100% on AC without interruption. After that cycle, the BIOS should report a normal health status.