Spring Bolt TD-LTE Replacement Battery 3.85V 3200mAh

Spring Bolt TD-LTE — 3.85V Li-Polymer Replacement Battery

This is a 3.85V, 3200mAh Li-Polymer replacement battery for the HTC Bolt TD-LTE smartphone. It slots in where the original cell has degraded and can no longer hold a usable charge. Voltage and physical dimensions match the OEM cell: 95.40 x 47.00 x 3.90mm.

• Bolt TD-LTE fit: The Bolt TD-LTE runs a 3.85V nominal rail with a Li-Polymer cell format — flat pouch, not cylindrical. This cell matches that rail and connector footprint. No adapter, no modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Bolt TD-LTE platform. The BMS accepted the cell without fault codes, and the charge IC ramped current normally through CC and CV phases.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one full discharge-charge cycle. The fuel gauge IC is calibrated to the old cell's discharge curve. Running one uninterrupted cycle at standard current lets the coulomb counter reset its reference points against the new cell before high-current charging begins.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity defect. Under high-drain loads — LTE modem, GPS, screen at full brightness — the cell voltage drops faster than the fuel gauge expects. The phone's protection circuit sees voltage fall below the safe threshold and cuts power before the gauge reads zero. The old cell's discharge curve is still baked into the fuel gauge IC. One full discharge-charge cycle at standard current rewrites that reference and removes the premature cutoff.

USB-PD fast charge not triggering after cell swap

After a cell replacement, the charge IC sometimes defaults to standard 5V charging and does not negotiate the fast-charge protocol on the first cycle. This happens because the BMS presents different impedance characteristics on a new, uncycled cell, and the charge controller falls back to a conservative profile. Run one full standard-rate charge cycle first. After that cycle, fast charging typically resumes — the BMS has completed its initial resistance measurement and the charge IC accepts the higher-voltage handshake.