Cricket Optimus Regard 3.7V 1200mAh Replacement Battery

Cricket Optimus Regard / LW770 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1200mAh Li-ion cell for the Cricket Optimus Regard (LW770). It fits directly into the original battery bay and restores power to a phone that no longer holds a charge. Capacity is rated at 4.44Wh, matching the original cell specification.

• Optimus Regard / LW770 fit: Both model designations refer to the same hardware platform. The battery bay dimensions, connector pin-out, and charge IC communication lines are identical across both — one cell covers both variants.
• Bench tested on actual hardware: We cycled this cell through the LW770 charge IC and confirmed the BMS accepted a full charge-to-cutoff sequence without triggering an over-voltage fault or safety lockout. Discharge profiling showed a stable voltage curve across the full state-of-charge window.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-charge cycle before normal use. The fuel gauge IC on the LW770 is calibrated to the old cell's discharge curve — skipping this step can cause the percentage readout to drift or jump erratically in the first few days.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff issue, not a capacity defect. When the modem radio or screen backlight draws a burst of current, the cell voltage briefly dips below the system's cutoff threshold — even though the fuel gauge still shows charge remaining. The phone interprets that voltage drop as a dead battery and shuts down. Running one full discharge cycle to 0% and recharging to 100% lets the coulomb counter re-anchor its endpoints to the new cell and typically resolves the false cutoff.

Phone warm near the battery compartment on the first few charges

A new cell starts with higher internal impedance than a worn one. The charge IC on the LW770 pushes current at the same rate regardless, which generates more heat across that higher resistance until the cell conditions over the first two or three cycles. Surface warmth during charging is normal at this stage. If the phone gets hot to the touch or shuts down mid-charge, check that the battery contacts are fully seated — a misaligned connector increases resistance further and amplifies the effect.