HTC Desire 530 Replacement Battery B2PST100 3.85V 2200mAh

HTC Desire 530 — 3.85V Li-Polymer Replacement Battery (B2PST100)

This is a 3.85V, 2200mAh Li-Polymer replacement battery for the HTC Desire 530, Desire 530 4G, A16, and D530u, among other variants. It replaces OEM parts B2PST100 and 35H00257-00M. Install it when the original cell can no longer hold adequate charge through a normal day of use.

• Desire 530 variant coverage: The Desire 530 family shares a common connector pinout, physical footprint (66.90 × 56.70 × 3.50mm), and 3.85V nominal rail across all listed variants. One cell fits the full range without adapter or modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Desire 530 platform. The BMS communicated correctly with the charge IC, accepted current without interruption, and reported state-of-charge back to the OS throughout the full cycle.
• First-cycle fuel gauge recalibration: After installation, disable fast charging and run one complete discharge-charge cycle at standard rate. The fuel gauge IC on the Desire 530 calibrates its coulomb counter against the new cell's discharge curve on that first pass — skipping it causes erratic percentage readings in early use.

Why the Desire 530 reports wrong battery percentage after a cell swap

The Desire 530 uses a fuel gauge IC that builds its charge model from the previous cell's discharge curve. When a new cell goes in, that stored model no longer matches real cell behaviour, so the percentage display drifts or jumps. The fix is one full discharge to around 3.0V under normal load, followed by an uninterrupted charge to 100%. After that cycle, the coulomb counter resets against the new cell and percentage reporting stabilises.

Sudden shutdown at 20–30% on the replacement cell

This happens when the fuel gauge IC is still running the old cell's voltage curve and the phone hits a modem or display load spike. Voltage sags below the BMS cutoff threshold before the displayed percentage reaches zero, so the phone shuts off without warning. It is not a fault in the replacement cell — it is the gauge misreading the new cell's lower internal resistance profile. Run one full discharge-charge cycle at standard current and the shutdowns stop once the counter recalibrates.