About this replacement
Emporia TELEME A3620 — 3.7V Li-ion Replacement Battery (AK-A3630)
This is a 3.7V, 1100mAh Li-ion battery for the Emporia TELEME A3620 mobile phone. It replaces OEM part AK-A3630 when the original cell has lost capacity through age or physical damage. Dimensions are 55.80 × 35.34 × 5.25mm — confirm these against your existing cell before fitting.
- TELEME A3620 fit: The A3620 uses a single-cell 3.7V nominal Li-ion pack with a low-pin connector tied directly to the phone's charge IC. Voltage, connector pinout, and BMS handshake all match the OEM AK-A3630 specification.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the A3620 platform. The BMS communicated correctly with the charge IC, accepted current without fault flags, and held voltage within the expected window across the full discharge curve.
- Fuel gauge recalibration after swap: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before high-current charging pushes current into an uncalibrated cell.
Why the TELEME A3620 reports wrong battery percentage after a cell swap
The A3620 uses a fuel gauge IC that builds its charge model by tracking coulombs in and out over time. When you fit a new cell, the IC still holds the learned curve from the old, degraded cell. It will misread state-of-charge until it runs at least one full discharge-to-charge cycle against the new cell. Expect percentage jumps or inaccurate readings for the first one to two cycles — this is normal recalibration, not a fault with the replacement cell.
Sudden shutdown at 20–30% on the replacement cell
This happens when the fuel gauge IC's stored discharge curve ends earlier than the new cell's actual voltage cliff. The phone cuts power thinking the cell is exhausted, even though usable capacity remains. Run one full uninterrupted discharge — let the phone shut itself off at 0% — then charge to 100% without interruption. After that cycle, the fuel gauge recalibrates its cutoff point and the early shutdown stops.