HTC 10 Evo B2PYB100 Replacement Battery 3.85V 3200mAh

HTC 10 Evo — 3.85V Li-Polymer Replacement Battery (B2PYB100)

This is a 3200mAh Li-Polymer cell rated at 3.85V, built to replace the original B2PYB100 battery in the HTC 10 Evo. It fits the 10 Evo TD-LTE and M10f variants using the same connector and BMS handshake as the factory cell. Capacity matches the stock specification at 12.32Wh.

• 10 Evo and M10f compatibility: These models share the same power management IC, voltage rail at 3.85V nominal, and ZIF connector footprint. The B2PYB100 part number covers all variants in this lineup — the BMS on each accepts the same charge termination signal from this cell.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the 10 Evo platform. The BMS accepted charging without fault codes, and the fuel gauge IC tracked state-of-charge correctly after one full calibration cycle.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This gives the fuel gauge IC time to map the new cell's discharge curve before high-current charging pushes current into an uncalibrated counter — preventing percentage jumps and early shutdown flags.

Sudden shutdown at 20–30% on the replacement cell

A new Li-Polymer cell has a slightly different voltage-to-capacity curve than the aged cell the fuel gauge IC was calibrated to. When the modem or display draws a current spike, voltage sags below the protection threshold before the reported percentage reaches zero. The phone interprets this as a critical low-voltage event and cuts power immediately. One full discharge to true empty — then a full charge without interruption — resets the coulomb counter and aligns the IC to the new cell's actual curve.

USB-PD fast charge not accepted on the first cycle after replacement

On the first charge cycle, the BMS on a fresh cell may present higher internal impedance than the charge IC expects from an authenticated fast-charge session. The phone's power management unit detects this mismatch and falls back to standard 5V charging as a safety measure. This is not a fault with the cell or the charger. Completing one full standard-rate charge cycle drops the cell's impedance into the accepted range, and fast charging resumes normally on the next session.