Tracfone Fiesta LTE Compatible Battery 3.85V 4500mAh

Tracfone Fiesta LTE / L64VL — 3.85V Li-Polymer Replacement Battery

This 3.85V, 4500mAh Li-Polymer cell replaces the original battery in the Tracfone Fiesta LTE and L64VL smartphones. It fits the battery bay directly and connects to the same charge IC and fuel gauge IC as the factory cell. Capacity figures come from the product data: 4500mAh / 17.33Wh.

• Fiesta LTE and L64VL fitment: Both model numbers share the same battery bay dimensions, connector pinout, and BMS handshake protocol — one cell covers both variants without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Fiesta LTE platform. The BMS accepted the charge IC handshake on the first cycle without fault flags, and cell voltage held stable through a full discharge sweep.
• Fuel gauge recalibration on first cycle: After installing this cell, disable fast charging and run one complete discharge-to-charge cycle at standard current. The Fiesta LTE fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve on that first cycle — skipping it causes percentage reporting errors for weeks.

Why the Fiesta LTE shuts down at 20–30% after a cell swap

The Fiesta LTE's fuel gauge IC carries the old cell's discharge curve in memory after replacement. When the new cell hits a voltage point that the old curve mapped to 20–30%, the phone treats it as a cutoff threshold and shuts down — even though real charge remains. The fix is one full discharge to 0% followed by a full charge to 100% at standard current. After that cycle, the coulomb counter resets and the percentage readout tracks the new cell accurately.

USB fast charge not activating on the first cycle after replacement

On the first charge after installation, the Fiesta LTE's charge IC may refuse to negotiate the fast-charge protocol with an uncalibrated BMS — the handshake fails a safety check and the device falls back to standard 5V charging. This is normal behaviour on cycle one, not a fault with the cell. Run the first full charge at standard current, let it complete, and the BMS state registers correctly. Fast charge resumes on the second cycle once the charge IC recognises the BMS as initialised.