If you're looking for replacement 3.7V Li-ion batteries for Apple AirPods 1st and 2nd generation, there are a few good options available. Keep in mind that replacing the battery in AirPods can be quite tricky since they are small and compact, and doing it yourself requires precision and careful handling to avoid damaging internal components.

Recommended Replacement Batteries for AirPods 1st and 2nd Generation

1. iFixit AirPods Battery Replacement Kit

• Description: iFixit offers replacement batteries for various Apple devices, including AirPods. They also provide a full kit with the necessary tools and guides to replace the batteries safely.

• Specs: The battery they offer is a 3.7V lithium-ion battery designed specifically for AirPods.

• Pros: Comes with repair tools and instructions; high-quality parts.

• Cons: Requires careful handling; DIY repair might void any warranty.

• Link: iFixit AirPods Battery Replacement

2. NewPower99 AirPods Battery Replacement Kit

• Description: NewPower99 provides aftermarket replacement batteries for AirPods 1st and 2nd generations. Their kits come with two batteries (since AirPods have two individual batteries) and the necessary tools to perform the replacement.

• Specs: 3.7V lithium-ion batteries compatible with AirPods.

• Pros: Good price; includes everything you need for replacement.

• Cons: Aftermarket batteries might not have the same longevity as original parts.

• Link: NewPower99 AirPods Battery Kit

3. BatteryBro AirPods Replacement Battery

• Description: BatteryBro specializes in AirPods battery replacements and offers high-quality lithium-ion batteries for the 1st and 2nd generation AirPods. Their batteries are designed to be the same size and capacity as the original ones.

• Specs: 3.7V Li-ion, designed for AirPods 1 and 2.

• Pros: Affordable and efficient; comes with a detailed guide.

• Cons: Aftermarket replacement may not be as reliable as original Apple batteries.

• Link: BatteryBro AirPods Replacement

Important Notes:

1. DIY vs. Professional Repair: Replacing AirPods batteries is not an easy task, and the small size of the AirPods makes it difficult to access the internal parts without damaging them. If you're not experienced with electronics repair, consider sending them to a professional or using Apple's official repair service.

2. Battery Quality: While third-party batteries can work well, there is always a chance that they won’t last as long as Apple’s original components. Always check reviews and ensure that the batteries have been tested for longevity and reliability.

3. Warranty: DIY battery replacement might void your warranty, so it’s important to consider this if your AirPods are still under warranty.

Would you like me to help find more specific sellers or detailed instructions for replacing the batteries yourself?