Originally Posted by kleykenb
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.
A battery not being used at all will empty, and will more likley be dead by then.
You need to make sure the battery is used every now and then.