About this replacement
Apple iPod Touch 6th Generation — 3.85V Li-Polymer Replacement Battery (A1641)
This is a 3.85V, 1000mAh Li-Polymer battery for the Apple iPod Touch 6th generation (model A1574). It replaces part numbers A1641 and 020-00425. Fit this battery when your iPod Touch no longer holds a useful charge or fails to power on after sitting unused.
- iPod Touch 6th generation (A1574) fit: The 6th-gen iPod Touch uses a specific slim Li-Polymer cell at 3.85V with a proprietary flex connector. This battery matches that connector pinout and cell dimensions (66.00 × 50.20 × 2.50mm), so the BMS handshake with the device's charging circuit completes correctly.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the iPod Touch 6th-gen platform. The BMS engaged charge termination cleanly at full voltage and held the low-voltage cutoff without tripping early under audio playback load.
- Post-swap charge cycle on the iPod Touch: After fitting a new cell, the Touch's battery indicator needs a full uninterrupted charge cycle to anchor its voltage-threshold readings. Plug into a wall adapter — not a PC USB port — and leave it connected until the charging indicator clears on its own.
Battery percentage jumping after a cell swap on the iPod Touch 6th
The iPod Touch tracks battery state using voltage thresholds mapped to the original cell's discharge curve. After a cell swap, those stored reference points no longer match the new cell's actual voltage behaviour. The result is a percentage gauge that jumps — sometimes from 80% straight to 20% — or a device that shuts off while still showing charge remaining. One complete charge-discharge cycle recalibrates the thresholds. Drain the device until it shuts off on its own, then charge uninterrupted to full at 5V/1A.
iPod Touch 6th not waking after extended storage
Li-Polymer cells that drop below approximately 2.5V enter a deep-discharge protection state where the BMS blocks normal charge current entirely. A Touch that has sat unused for months will often show a blank screen and seem completely dead. Connect it to a 5V wall adapter and leave it for 30 minutes before attempting to power it on — the BMS requires a slow trickle charge to bring the cell voltage back above the recovery threshold. Once the charging screen appears, the device is out of protection mode and will accept a full charge normally.