There are many types of rechargeable batteries. Some deteriorate quickly over time (especially when used) but others do not have that problem, or at least not as much.
I don't recall which type of battery the Gen3 has so can't really research the issue but I assume you've done that homework :-)
The battery that has never been used should be in best nick, obviously, but the battery that has been used slightly should still be a whole lot better than a battery that's had hundreds of charge-cycles.
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