How long sealed ipod 5th nano battery last?

[iMore Question]

How long will an ipod 5th nano battery last if an unopened sealed new ipod is opened today? Is the battery stronger or weaker an one in an ipod used gently?

 

[Rob Phillips]

Welcome to iMore! Apple's lithium batteries are designed to retain 80% of original capacity for 500 complete charge cycles. That being said, it's safe to say that batteries generally degrade over time and that a brand new battery will outperform a used battery. To what extent the new battery outperforms is dependent on how degraded the used battery is.