Explay Ice 3.7V 900mAh Replacement Battery

Explay Ice — 3.7V Li-ion Replacement Battery

This is a 3.7V, 900mAh (3.33Wh) lithium-ion cell for the Explay Ice smartphone. It fits directly into the Ice's battery compartment at 53.00 × 34.00 × 4.80mm. Replace this when the original cell no longer holds a charge or the phone shuts down unexpectedly.

• Explay Ice fit: The Ice uses a compact single-cell 3.7V pack with a low-current BMS matched to its basic modem and display load. The cell dimensions and connector position are fixed to this model — no modification needed.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Ice platform. The BMS accepted the charge IC handshake cleanly, held voltage through screen-on and call simulation, and cut off correctly at the low-voltage threshold.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to automatic shutoff, then charge uninterrupted to 100% before normal use. The Ice's fuel gauge IC is calibrated to the old cell's discharge curve — this single cycle resets it to the new cell so percentage readings stay accurate.

Sudden shutdown at 20–30% on the Explay Ice

The Ice's fuel gauge IC maps percentage to voltage using a stored discharge curve from the original cell. A new cell has a slightly different voltage-to-capacity profile, so the gauge hits its low-voltage cutoff point before the displayed percentage reaches zero. The phone reads 25% but the actual cell voltage has already dropped below the BMS floor under modem or screen load. One full discharge-charge cycle rewrites the reference curve and stops the early cutoff.

Explay Ice not powering on after sitting in storage

Lithium-ion cells self-discharge in storage. If the Ice has been unused for months, the cell voltage may have dropped below 2.5V — at that point the BMS enters lockout and blocks current flow to protect the cell from damage. Plugging in a charger often shows no response because the charge IC won't start a fast-charge cycle into a locked-out pack. Connect the phone to a wall adapter and leave it for 15–20 minutes without pressing the power button — most charge ICs will trickle current through to recover the cell above the BMS re-enable threshold of around 2.9V.