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Originally Posted by jhom
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I am considering purchasing a pair. Any regrets for use with the 51v? Also, is the battery user replaceable?
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The battery is not user replacable - it's built-in.
I have a Rev-A version and with the last firmware update, they seem to work OK. The current rev is Rev-C I believe which has better firmware. Don't get the Rev-A units as they had issues with cutting out if both WiFi and BT were used at the same time on the X50v.
Since I've never owned a newver version, I can't comment but others on this site could.