If you use lots of batteries frequently, then any of the better brands of rechargeables are worth it, but remember to keep a stash of disposable cells in case grid or other power is not available for recharging.
I do keep a bunch of Duracells around (you never know), but wouldn't a solar charger solve, or at least mediate this problem?
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Whenever you rest, someone, somewhere is training to kick your ass.
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