Cricket Optimus Regard Li-ion Compatible Battery 3.7V 2400mAh

Cricket Optimus Regard LW770 — 3.7V Li-ion 2400mAh Replacement Battery

This 3.7V 2400mAh Li-ion battery replaces the original cell in the Cricket Optimus Regard (LW770) smartphone. It fits the same physical bay and connects to the same charge IC. Capacity is 2400mAh — listed as 8.88Wh at rated voltage.

• Optimus Regard / LW770 fit: Both model designations refer to the same hardware platform. The voltage rail, connector pinout, and BMS handshake are identical across the Regard and LW770 variants, so one cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the LW770 platform. The BMS accepted charging, the protection circuit tripped correctly at low-voltage cutoff, and the charge IC completed a full cycle without thermal shutdown.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one complete discharge-to-charge cycle. This gives the fuel gauge IC a clean reference curve against the new cell before high-current charging is introduced into an uncalibrated measurement window.

Why the Optimus Regard reports wrong battery percentage after a cell swap

The LW770 uses a coulomb counter that accumulates charge data over time and builds a model of the cell's discharge curve. When you swap the physical cell, that learned curve no longer matches the new cell's actual voltage-to-capacity relationship. The OS reads the old model against the new cell's voltage and outputs a percentage that can be off by 10–20 points. One full discharge down to automatic shutdown, followed by a full charge to 100%, forces the fuel gauge IC to re-anchor its reference points to the new cell. After that cycle, percentage readings stabilise.

Sudden shutdown at 20–30% remaining on the replacement cell

This happens when the modem or display pulls a current spike the cell cannot sustain at that state of charge — voltage sags below the BMS cutoff threshold even though the gauge still shows charge remaining. It is more common immediately after installation because the fuel gauge IC is still running on its old discharge model. Run the recalibration cycle first. If shutdowns continue after one full cycle, check that the cell contacts are seated flat — a lifted corner increases contact resistance and worsens voltage sag under load. A correctly seated, calibrated cell should hold voltage above 3.5V under normal screen-on load.