Cricket Crosswave 3.7V Replacement Battery 1100mAh Li-ion

Cricket Crosswave — 3.7V Li-ion Replacement Battery

This is a 3.7V, 1100mAh Li-ion cell for the Cricket Crosswave smartphone and EC5805. It replaces an original cell that no longer holds voltage under screen or modem load. Swap it in when the phone dies early, refuses to charge, or drains faster than it used to.

• Crosswave and EC5805 fit: Both the Crosswave and EC5805 share the same 3.7V single-cell platform, connector pinout, and charge IC handshake — one cell covers both. Physical dimensions are 54.05 × 34.10 × 5.40mm, so clearance in the battery bay is exact.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the Crosswave platform. The BMS accepted the charge profile without interruption, and protection circuits tripped correctly at low-voltage cutoff. No thermal anomalies were recorded during the charge phase.
• First-cycle fuel gauge reset: On first use after installation, disable fast charging if the option is available, then run one complete discharge-to-charge cycle. This lets the fuel gauge IC recalibrate its coulomb counter against the new cell's discharge curve before it starts reporting accurate percentages.

Sudden shutdown at 20–30% on the replacement cell

The Crosswave's fuel gauge IC was calibrated to the discharge curve of the original aged cell. A fresh cell has a steeper voltage cliff at the low end — the phone sees a voltage drop it reads as empty before the cell is actually depleted. This causes abrupt shutdowns that look like a defective battery but are not. Run two full discharge-charge cycles without interruption and the gauge recalibrates. After that, shutdowns below 15% are normal low-battery protection kicking in at approximately 3.2V.

Phone will not power on after the battery sat discharged in storage

If the Crosswave was stored with a depleted cell, the BMS may have tripped into deep-discharge lockout once cell voltage dropped below 2.5V. In this state the phone shows no charging indicator and appears completely dead. Connect it to a wall charger — not a USB port — and leave it untouched for 20 to 40 minutes. The charge IC delivers a trickle current that slowly recovers cell voltage back above the BMS wake threshold of around 2.9V, after which normal charging resumes.