Cricket Ovation U705AC Compatible Battery 3.85V 3750mAh

Cricket Ovation U705AC — 3.85V Li-Polymer Replacement Battery

This is a 3.85V Li-Polymer battery rated at 3750mAh (14.44Wh) for the Cricket Ovation (U705AC). It fits directly into the Ovation's battery bay and connects to the same flex connector and BMS contact points as the original cell. Use this when the stock battery no longer holds charge, swells, or drops voltage suddenly under load.

• Ovation U705AC fit: The U705AC uses a single Li-Polymer cell with a 3.85V nominal rail. The BMS on this phone negotiates directly with the cell's protection circuit — physical dimensions (86.45 × 63.80 × 4.00mm) and connector pinout must match exactly, which this cell does.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the U705AC platform. The BMS accepted the cell without error flags, protection cutoff triggered correctly at low voltage, and charge termination behaved normally across two full cycles.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes power into an uncalibrated cell — preventing false percentage readings early on.

Sudden shutdown at 20–30% on the Cricket Ovation after a cell swap

This happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. A new cell holds a slightly different voltage profile at each state of charge, so the IC reads 20–30% remaining but the actual cell voltage drops below the modem and display load threshold. The phone shuts off to protect the BMS even though the percentage looks safe. One full discharge-to-cutoff and full recharge cycle resets the coulomb counter against the new cell's actual curve.

USB fast charge not activating after replacement on the U705AC

On the first cycle after a cell swap, the charge IC may default to standard 5V/1A input while it evaluates the new cell's impedance. This is normal — the charge IC runs a brief conditioning pass before enabling higher-current protocols. Plug in with the original charger and let the first charge complete fully without interruption. Fast charging typically resumes from the second cycle onward once the IC has profiled the new cell.