Aligator A310 Compatible Battery 3.7V 900mAh Li-ion

Aligator A310 / A340 / V600 — 3.7V Li-ion Replacement Battery

This is a 3.7V, 900mAh (3.33Wh) Li-ion replacement battery for the Aligator A310, A340, and V600 feature phones. It slots directly into the battery bay and reconnects to the stock charge circuit. Use the capacity figure above — 900mAh — as your reference; ignore any third-party listings quoting different numbers.

• A310, A340, and V600 compatibility: These three Aligator models share the same 53.00 × 34.00 × 4.80mm cell footprint and the same 3.7V single-cell architecture, so one SKU covers all three. The connector pinout and BMS handshake voltage are identical across the range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a bench rig monitoring BMS cutoff thresholds. The protection circuit tripped correctly at the low-voltage floor and the charge IC accepted the cell without fault flags on the first cycle.
• Fuel gauge recalibration on first use: After fitting this cell, run one full discharge to auto-off then charge uninterrupted to 100% before using the phone normally. The fuel gauge IC on these Aligator models calibrates its coulomb counter against the first complete cycle — skipping this step causes erratic percentage readings for the first week of use.

Why the A310 reports wrong battery percentage after a cell swap

The fuel gauge IC on the A310 stores a discharge curve model calibrated to the original cell. When a new cell goes in, that stored model no longer matches the actual voltage-to-capacity relationship of the replacement. The IC reads voltage correctly but maps it to the wrong state-of-charge percentage. One full discharge-charge cycle forces the coulomb counter to rebuild its reference curve against the new cell, after which percentage accuracy returns to normal.

Sudden shutdown at 20–30% on the replacement cell

This happens when the cell voltage drops below the modem's minimum operating threshold under load — even though the fuel gauge still shows charge remaining. Feature phones like the A310 pull a brief current spike during network registration or an outgoing call, and a new cell that hasn't been through a calibration cycle can hit a localised voltage cliff faster than the gauge expects. The BMS reads this as an unsafe undervoltage condition and cuts output. Run the phone through one full discharge cycle to the auto-off point, then charge to 100% — this aligns the fuel gauge curve with the cell's actual voltage floor, typically around 3.0V under load.