Aligator A600 Replacement Battery 3.7V 1300mAh Li-ion

Aligator A600 / A620 / A680 Series — 3.7V Li-ion Replacement Battery

This 3.7V, 1300mAh Li-ion cell replaces the original battery in the Aligator A600, A610, A620, and A680 smartphones. It matches the stock voltage rail and physical footprint at 60.00 × 43.80 × 4.50mm. Use this when the original cell no longer holds a charge or the phone shuts down unpredictably.

• A600 / A610 / A620 / A680 platform fit: These models share the same battery bay dimensions, 3.7V nominal voltage, and connector orientation — one cell covers the full lineup without modification.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on compatible hardware. The BMS held cutoff at the correct low-voltage threshold and accepted charge current without tripping protection prematurely.
• Fuel gauge recalibration on first use: On the first cycle after installation, run the phone down to automatic shutdown, then charge uninterrupted to 100% before use. This gives the fuel gauge IC a complete reference curve for the new cell — skipping this step is the main reason percentage readings jump erratically in the first few days.

Sudden shutdown at 20–30% on a freshly installed cell

The Aligator A600 series uses a coulomb-counter fuel gauge that was calibrated to the discharge curve of the original cell. A new cell has a slightly different internal resistance profile, so the gauge miscalculates the voltage cliff. When the modem fires up for a call or the screen peaks brightness, current draw spikes and the cell voltage drops below the BMS cutoff threshold — even though the gauge still reads 20–30%. One full discharge-to-shutdown followed by an uninterrupted charge resets the reference points. After that cycle, shutdowns at high reported percentages stop.

Phone feels warm near the battery during the first few charges

A new Li-ion cell starts with slightly higher internal impedance than a broken-in cell. The charge IC pushes current into higher resistance, and the heat generated is normal for the first two to three cycles. It should decrease noticeably by the third full charge. If the phone stays hot past five cycles or gets too hot to hold comfortably, check that the battery connector is seated flush — a partial connection raises contact resistance and amplifies heating.