About this replacement
Asus PadFone X Mini Station — 3.8V Li-Polymer Replacement Battery (0B200-01140000)
This 3.8V, 2100mAh Li-Polymer cell replaces the internal battery in the Asus PadFone X Mini Station docking accessory. It fits the Station unit used with the T00SP and S416 handsets — not the phone itself. Without a functioning cell here, the dock loses its ability to charge the inserted smartphone.
- PadFone X Mini Station fit — T00SP, S416, C11PHJM: These models share the same dock chassis, connector layout, and BMS handshake protocol. The 0B200-01140000 cell is the only configuration that satisfies the dock's fuel gauge IC and charge path logic.
- Bench tested on actual hardware: We cycled this cell through the dock's charge IC and confirmed BMS communication, cutoff thresholds, and pass-through charging behaviour to the inserted phone. No false full-charge flags on bench.
- First-cycle fast-charge protocol on the dock: On first use after installation, disable fast charging on the connected phone for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's actual discharge curve before high-current charging is applied to an uncalibrated cell.
Why the phone reports wrong battery percentage after a dock cell swap
The dock's fuel gauge IC builds its capacity map from cumulative coulomb-counting data tied to the old cell. When a new cell goes in, that map is stale — the IC still expects the old discharge curve. The phone reads percentage data passed from the dock's controller, so it inherits the same miscalibration. One full discharge to cutoff followed by an uninterrupted charge to 100% forces the IC to rewrite its reference points against the new cell. After that cycle, reported percentages track actual capacity correctly.
Dock not powering on after sitting in storage with a depleted cell
Li-Polymer cells dropped below approximately 2.5V trigger a BMS lockout — a hard protection state that blocks normal charge input. A standard charger through the dock port will not recover the cell from this state. To attempt recovery, apply a regulated 3.6V trickle current directly to the cell terminals for 10–15 minutes to nudge voltage above the BMS re-entry threshold, then reconnect the dock to its standard charger. If cell voltage does not climb past 3.0V within 20 minutes of trickle input, the cell has degraded past recovery and needs replacement.