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Rechargeable battery's tend to lose about 1% a day. Leave them in the drawer for 3 weeks or more and your looking at battery's that only have 3/4 of a charge left.
On my JBL with average reading I get about a week on a set.
So if I swapped battery's on Monday, come Thursday I put them on to charge.
Granted they may lose a few % but usually not enough to bother. I'd rather be safe with a second set ready to go. Than be caught with no charged ones for the book.
I'm using 2500ma battery's by Energizer with a 8 hour charger.
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