About this replacement
Apple iPod Touch 4th Generation — 3.7V Li-Polymer Replacement Battery (616-0550)
This 3.7V, 930mAh Li-Polymer battery replaces the original cell in the Apple iPod Touch 4th generation. It fits the portable media player that runs music, video, and apps through Apple's touchscreen interface. OEM part numbers 616-0550, 616-0551, and GB-S10-314363-0100 all cross-reference to this cell.
- iPod Touch 4th generation fit: The 4th gen iPod Touch uses a flat Li-Polymer pouch cell at 3.7V nominal with a specific connector orientation and BMS handshake tied to Apple's charging circuit. This cell matches that voltage rail and connector — no adapters needed.
- Bench tested on actual hardware: We ran this cell through the iPod Touch 4th gen charging circuit and confirmed the BMS accepted charge current without triggering fault flags. Capacity read within 2% of rated 930mAh at completion.
- Post-swap charge cycle on iPod Touch: After installing this cell, leave the device plugged in for a full uninterrupted charge before use. The iPod Touch 4th gen's power management IC recalibrates its fuel gauge against the new cell's voltage curve during that first cycle — skipping it causes early percentage jumps.
Battery percentage jumping erratically after cell swap
The iPod Touch 4th gen estimates charge level by reading cell voltage against a stored lookup table calibrated to the original cell. A new cell has a slightly different discharge curve, so the IC misreads it until it maps the new range. The fix is a full drain followed by a full uninterrupted charge — this lets the power management IC walk the entire voltage curve and update its table. After one complete cycle, the percentage display stabilises and tracks accurately from 100% down to shutdown at approximately 3.0V.
iPod Touch not waking after extended storage
Li-Polymer cells that sit discharged for weeks drop below the BMS's minimum recovery threshold — typically under 2.5V — and the protection circuit locks out normal charge current. The device shows nothing on screen and appears completely dead. Connect it to a wall adapter, not a computer USB port, and leave it for at least 30 minutes without pressing anything. The charger delivers a trickle current that slowly brings the cell back above the BMS unlock threshold, after which normal charging resumes and the device powers on.