The manual indicates that the battery is not replaceable.  What happens when the battery no longer holds a charge?  How long should the battery last?

The battery in the Clip should provide several years of reliable service.  It is a Lithium Polymer unit, and will serve you well as long as you plug in regularly.

Bob  :wink:

If I recall correctly, the battery should get 300-500 full charges (this is full charges; if you only charge 50% at a time, that would take 2 partial charges to get a full charge).  And so you can use that to calculate about how long your battery might last.