iPhone 3GS Battery

Each replacement battery is designed for specific iPhone models. Check the “Compatibility” info box on this product page for details or use our compatibility checking tool to find out whether your model is compatible. If you’re unsure which model you have, you can verify under Settings → General → About or use the model identification information provided in the compatibility checking tool.

If your iPhone drains unusually fast, runs hot, or shows Battery Health below 80%, it’s time for a battery swap. Apple designed the iPhone 14 and earlier models to retain at least 80% capacity for around 500 full charge cycles, while the iPhone 15 and newer aim for 1,000 cycles under ideal conditions. Actual battery life varies with usage, but if you see a performance drop earlier, a fresh battery is the simplest, most cost-effective way to keep your phone running smoothly.

Replacing a tired battery is usually the quickest and most cost-effective way to revive your phone’s performance. If your device otherwise meets your needs, a new battery can save you from an expensive upgrade.

Absolutely. We provide step-by-step repair guides and supply the specialized tools needed to open and reassemble your iPhone. However, removing your old battery requires care and patience. Make sure to not bend or puncture your old battery while removing it from the device. Use only plastic tools when prying. If you’re comfortable working with small connectors and following detailed instructions, you can save money and keep your phone running longer.

Yes. For optimal results, fully charge the new battery to 100% and continue charging for at least two more hours. Then use your device until it shuts off due to low battery, and finally charge it uninterrupted back to 100%. This helps the system to accurately measure battery capacity. Find more information on battery calibration here.

Depending on your iPhone model and iOS version, you may see an “Important Battery Message” or a missing Battery Health indicator—this doesn’t affect your phone’s everyday performance. As this is a software feature, your options will depend on the version of iOS you are currently using.

• On iOS 17.6 and earlier, your iPhone may display a warning about the “genuineness” of the battery after the repair, even when using original Apple parts.
• From iOS 18 onwards, Apple’s Repair Assistant allows for parts authentication. While Apple has promised to improve support for third-party batteries in June 2024, including showing battery health metrics, as of iOS 18.2.1 support for third-party batteries remains unimplemented. If your iPhone functions normally, you can safely ignore the warning.

Yes. Our replacement batteries come with a limited 1 year warranty. For full details on coverage and how to submit a claim, visit our Warranty Policy page.

Lithium-ion batteries require special handling and can't be disposed of in general recycling. Most electronics stores, recycling centers, and municipalities have battery drop-off programs. Check your local regulations or consult our recycling guide to ensure a safe, eco-friendly disposal. If your battery is swollen, please make sure to read our guide on handling swollen batteries.