HE401 Cricket Splendor Replacement Battery 3.85V 3600mAh

Cricket Splendor / Icon 3 — 3.85V Li-Polymer Replacement Battery (HE401)

This is a 3.85V, 3600mAh Li-Polymer replacement battery for the Cricket Splendor, Icon 3, EC211002, and EC211003 smartphones. Part number HE401 matches the original cell footprint at 79.00 × 61.60 × 4.10mm. Swap it when the original cell no longer holds a usable charge across a normal day of calls and screen time.

• Splendor / Icon 3 platform compatibility: The EC211002 and EC211003 share the same mainboard voltage rail and connector pinout as the branded Splendor and Icon 3 variants. One cell services all four models without any adapter or wiring change.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the EC211002 mainboard. The BMS accepted the charge handshake cleanly, protection thresholds tripped correctly at both ends of the voltage window, and no thermal anomalies appeared during constant-current phase.
• Fuel gauge recalibration on first use: After installation, disable fast charging and run one complete discharge-to-charge cycle at standard rate. This lets the fuel gauge IC map the new cell's discharge curve before fast-charge current is applied to an uncalibrated cell.

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

A new cell has a discharge curve the fuel gauge IC has never seen. The IC is still referencing the old cell's voltage-to-capacity map, so it misreads remaining charge. Under load from the modem or display, the actual cell voltage drops below the BMS cutoff threshold before the OS percentage reaches zero. The phone shuts off mid-use at what looks like 25% remaining. One full discharge-to-shutdown followed by a full charge resets the coulomb counter against the new cell curve and clears this behaviour.

Phone will not power on after the HE401 has been sitting discharged in storage

Li-Polymer cells self-discharge slowly in storage. If the cell voltage drops below approximately 2.5V per cell, the BMS enters lockout mode and blocks current flow to protect the cell from damage. Plugging in the charger may show no response at all — no charging indicator, no boot. Connect the phone to a wall adapter and leave it undisturbed for 15–20 minutes. The charge IC will trickle-feed current below normal charge rate until the cell climbs above the BMS re-enable threshold, typically around 3.0V, at which point normal charging resumes.