Anycool Enjoy W02 3.7V 750mAh Replacement Battery

Anycool Enjoy W02 — 3.7V Li-ion Replacement Battery

This is a 3.7V 750mAh Li-ion battery for the Anycool Enjoy W02 smartphone. It replaces the original cell when the factory battery degrades, fails to hold charge, or causes the phone to shut down unexpectedly. Voltage and capacity match the original specification exactly.

• Enjoy W02 fitment: The Enjoy W02 uses a compact 53.00 × 33.90 × 5.70mm cell at 3.7V nominal. This replacement matches those dimensions and the voltage rail the phone's power management IC expects. A mismatched cell size or voltage can prevent the battery cover from seating or trigger immediate BMS rejection.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the bench. The BMS accepted the cell without error flags, the protection circuit tripped correctly at the low-voltage cutoff threshold, and charge termination fired at the expected full-charge voltage.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell — otherwise percentage readings drift and early shutdowns follow.

Sudden shutdown at 20–30% on the Enjoy W02 after a cell swap

This is a voltage cliff issue, not a capacity defect. At 20–30% state of charge, the new cell's voltage drops sharply under the combined load of the modem radio and display backlight. The phone's power IC reads that voltage drop as a critical low-battery event and cuts power before the fuel gauge shows 0%. One full discharge-charge cycle with the screen at low brightness recalibrates the fuel gauge IC and pushes the cliff below the shutdown threshold.

Enjoy W02 not powering on after sitting in storage with a flat battery

If the phone was stored discharged for weeks, the cell voltage may have dropped below 2.5V — the BMS lockout threshold. At that point the BMS disconnects the cell to prevent damage and the phone shows no response to the power button. Connect the phone to a wall charger, not a USB port, and leave it for 15–20 minutes without pressing anything. The charger's higher current wakes the BMS pre-charge circuit; once cell voltage climbs above 2.8V the BMS reconnects and the phone will boot.