Sanyo Eneloops are the best rechargeable batteries.
Sanyo invented the low-self-discharge NiMH battery. Unlike most rechargeable, it retains more of its power over time. There are competitors, but Sanyo still makes the best.
Vs. Regular Batteries
At ~$10 for 4AA, they’re easily twice as expensive as normal batteries, but you should use them much longer through charging and save money.
But it’s not really the money, it’s the convenience of just charging things instead of running out of batteries, running to the store to buy batteries, throwing out batteries constantly.
I’ve been using the original versions for years, and recently bought some of the improved 2011 editions. Never having to run out to buy batteries is easily worth the price.
Battery powered devices running out of power are one life’s small inconveniences that can be made much less annoying with a little bit of forethought.
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