HTC Wildfire E Lite BSF50 Replacement Battery 3.85V 3000mAh

HTC Wildfire E Lite — 3.85V Li-Polymer Replacement Battery (BSF50)

This is a 3000mAh (11.55Wh) Li-Polymer cell built to the BSF50 specification for the HTC Wildfire E Lite smartphone. It fits the original battery bay directly, matching the 78.60 × 59.70 × 4.00mm footprint and 3.85V nominal voltage. If your Wildfire E Lite is shutting down unexpectedly or losing charge rapidly, this replaces the degraded original cell.

• Wildfire E Lite compatibility: The BSF50 uses the same connector pinout and BMS handshake protocol as the factory cell. The Wildfire E Lite's charge IC negotiates with the battery over the third pin — this cell passes that handshake so the phone charges normally without flagging an unrecognised battery warning.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the Wildfire E Lite platform. The BMS held the 4.35V upper cutoff correctly and tripped the low-voltage cutoff at 3.0V per cell — no runaway, no thermal events during CC-CV charging.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle before relying on the percentage indicator. The Wildfire E Lite's fuel gauge IC holds the old cell's discharge curve in memory — one full cycle overwrites it with accurate data for the new cell.

Why the Wildfire E Lite reports wrong battery percentage after a cell swap

The Wildfire E Lite uses a coulomb-counter fuel gauge IC that stores a learned discharge curve from the old cell. When a new cell goes in, the IC applies that old curve to the new cell's actual voltage readings — the mismatch produces percentage errors of 10–25%. The fix is one full discharge down to automatic shutdown, then a full charge to 100% without interruption. After that single cycle, the IC recalibrates its curve to the new cell's chemistry. Subsequent readings stabilise within two or three more cycles.

Sudden shutdown at 20–30% on the replacement cell

This happens because the replacement cell's actual open-circuit voltage drops steeply below 3.6V under modem or screen load — faster than the fuel gauge IC expects. The phone reads 25% remaining but the cell voltage collapses below the BMS cutoff under the current draw, triggering an immediate shutdown. Power the phone back on and check the reading — if it restarts at the same percentage, the IC is miscalibrated, not the cell. Run one full discharge cycle to let the gauge re-learn the new cell's voltage cliff, and the shutdowns stop.