About this replacement
HTC Desire Eye Series — 3.85V Li-Polymer Replacement Battery (B0PFH100)
This 3.85V, 2400mAh Li-Polymer battery replaces the original cell in the HTC Desire Eye, Desire Eye 4G, and Desire Eye Dual SIM. OEM part numbers B0PFH100 and 35H00234-00M both apply to this cell. Swap it in when the original cell no longer holds a full day of charge.
- Desire Eye variant compatibility: The Desire Eye, Desire Eye 4G, and Desire Eye Dual SIM all share the same battery bay dimensions and 3.85V voltage rail. The connector and BMS handshake are identical across these variants, so one cell fits all three.
- Bench tested on actual hardware: We cycled this cell on the Desire Eye platform and confirmed the BMS communicates charge state correctly to the OS. The cell hit rated capacity within two full cycles and the charge IC held cutoff voltage cleanly at 4.35V.
- Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. This lets the fuel gauge IC map its coulomb counter against the new cell's actual discharge curve before high-current charging pushes current into an uncalibrated cell.
Sudden shutdown at 20–30% on a replacement cell
A new cell and the Desire Eye's fuel gauge IC start out of sync. The IC still references the discharge curve of the old, degraded cell. When the new cell hits a voltage point the IC maps to 20–30%, the actual cell voltage under screen or modem load drops sharply — and the phone shuts down to protect the circuit. One full discharge-charge cycle forces the coulomb counter to remap against the new cell. After that cycle, the percentage readings stabilise and the early shutdowns stop.
Phone won't power on after the battery sat in storage
Li-Polymer cells self-discharge in storage. If the cell voltage drops below 2.5V per cell, the BMS trips into lockout mode and blocks charge input to prevent thermal runaway. The phone will not respond to a standard charger. Use a USB charger capable of trickle output, or a dedicated cell charger with a recovery mode, to bring the cell above 3.0V slowly. Once the BMS sees voltage above that threshold, normal charging resumes and the phone will power on.