Cricket Crosswave 3.7V 700mAh Replacement Battery

Cricket Crosswave — 3.7V Li-ion Replacement Battery

This is a 3.7V, 700mAh Li-ion replacement battery for the Cricket Crosswave smartphone. It also fits the Crosswave WiFi Broadband Router and EC5805. Swap it in when the original cell can no longer hold a charge or the phone shuts down unexpectedly under load.

• Crosswave / EC5805 platform fit: These devices share the same battery footprint, connector pinout, and 3.7V nominal voltage rail. One cell covers all three fit models without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Crosswave platform. The BMS accepted charge current correctly and held cutoff voltage within spec at both ends of the curve.
• Fuel gauge recalibration on first install: 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 into an uncalibrated state.

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

The Crosswave's fuel gauge IC builds its discharge model against the original cell's internal resistance profile. A new cell has a different impedance curve, so the IC misreads remaining capacity. When the modem transmits or the screen peaks in brightness, current draw spikes and the new cell's voltage drops briefly below the shutdown threshold — even though the reported percentage still looks healthy. One full discharge-charge cycle forces the coulomb counter to reset and map the new cell accurately. After that cycle, the shutdowns stop.

Phone reports wrong battery percentage after replacement

The fuel gauge IC on the Crosswave stores a learned discharge curve from the old cell. Dropping in a new cell doesn't automatically clear that stored model. The result is percentage readings that jump erratically or plateau well above zero before the phone dies. Drain the battery completely until the phone powers off, then charge uninterrupted to 100% without interruption. That single full cycle resets the coulomb counter to the new cell's actual capacity.