About this replacement
HTC One ST / One SU / One SC — 3.7V Li-ion Replacement Battery (BM60100)
This is a 3.7V 1400mAh Li-ion cell replacing OEM part BM60100 in the HTC One ST, One SU, One SC, and T528t smartphones. It matches the original connector, dimensions (60.00 × 46.15 × 4.85mm), and BMS communication protocol. Swap it when your original cell can no longer hold a usable charge across a full day.
- One ST / SU / SC platform compatibility: These models share the same battery bay dimensions, 3.7V power rail, and connector pinout. The BM60100 part number covers all three variants plus the T528t because HTC used a common battery spec across that device generation. No adapter or modification needed.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on HTC One ST hardware. The BMS accepted charge from the phone's charge IC without tripping overcurrent protection, and voltage held stable under combined screen and modem load without sagging below the 3.2V cutoff.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC build an accurate discharge curve for the new cell before high-current charging runs against an uncalibrated reference — preventing erratic percentage readings from the first charge onward.
Why the HTC One ST reports wrong battery percentage after a cell swap
The phone's fuel gauge IC stores a learned discharge curve from the original cell. When you fit a new cell, that stored curve no longer matches actual cell behaviour. The IC applies the old model to the new chemistry, so the percentage it reports drifts from true state of charge. One full slow discharge down to automatic shutdown, followed by a full charge, forces the IC to recalculate against the new cell's actual voltage-to-capacity curve. After that cycle, percentage readings stabilise.
Sudden shutdown at 20–30% on the replacement cell
This happens when the cell voltage drops sharply under combined modem and display load — a voltage cliff the fuel gauge IC did not anticipate. The phone's low-voltage protection triggers an immediate shutdown even though the reported percentage still looks safe. The cause is the uncalibrated fuel gauge reading state of charge from stored data rather than live cell behaviour. Run one full discharge-charge cycle without fast charging; after recalibration, the IC will flag the approaching cutoff voltage accurately and the shutdowns stop.