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What Is the Lifespan of AirPods?
Well answer the second question first.

Meg MacDonald
The best results had the battery dropping to 80 percent capacity after about 400 cycles.
How Often Should I Charge My AirPods?
That depends on your actual use.
you could still use them after that, however.
Need to replace your AirPods?
it’s possible for you to find them on sale at Amazon, Best Buy, and other retailers.
Big changes can affect the batteries abilities to take and maintain a charge.
If its cold outside, keep them in your pocket.
Cleanliness is also important.
Keeping the speaker clean lets it work most efficiently.
If its clogged with debris, sound doesnt come through as well.
You may need to adjust the volume to compensate, meaning more battery drain.
Meg MacDonald
Dont leave transparency or noise canceling on all the time.
Charge to at least 80 percent.