ZTE S302 Replacement Battery Li3710T42P3h553657 3.7V 1050mAh

ZTE S302 — 3.7V Li-ion Replacement Battery (Li3710T42P3h553657)

This 3.7V Li-ion cell replaces the original battery in the ZTE S302 smartphone. It carries a capacity of 1050mAh (3.89Wh) and matches the OEM part number Li3710T42P3h553657. The physical dimensions — 55.42 × 35.01 × 5.41mm — match the S302 battery bay without modification.

• S302 platform fit: The S302 uses a slim single-cell Li-ion pack at 3.7V nominal. This cell replicates the connector pinout and BMS communication lines the phone's charge IC expects, so the device recognises the pack on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under load representative of the S302's modem and display draw. The BMS held cutoff correctly at the low-voltage threshold and did not trip during simulated peak-current events.
• Fuel gauge recalibration on first use: On first use after installation, disable fast charging and run one full discharge-charge cycle at standard rate. This lets the S302's fuel gauge IC map its coulomb counter against the new cell's discharge curve before any high-current protocol pushes current into an uncalibrated pack.

Sudden shutdown at 20–30% on the ZTE S302 after a cell swap

The S302's fuel gauge IC stores a learned discharge curve from the old cell. When a new cell goes in, that curve no longer matches the actual voltage-vs-capacity profile of the replacement. At high-draw moments — active LTE, screen at full brightness — the new cell's terminal voltage drops below the IC's cutoff threshold while the displayed percentage still reads 20–30%. The phone interprets this as a hard undervoltage event and shuts down. One full slow-rate discharge-charge cycle forces the IC to relearn the curve, and the shutdowns stop.

ZTE S302 not powering on after the battery sat discharged in storage

Li-ion cells that drop below roughly 2.5V trigger a BMS protection lockout — the pack disconnects itself to prevent cell damage, and the phone sees no power rail at all. Plugging into a charger may show no response for several minutes while the charge IC trickle-charges the cell back above the BMS re-enable threshold. Leave the phone on charge with a known-good cable and adapter for at least 15–20 minutes before attempting to power on. Once the cell reaches approximately 3.0V, the BMS re-initialises and normal charging resumes.