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She must have tried the garbage energizer rechargeable. Instead she should try the Eneloop rechargeable. They work much better, there voltage fully charged is 1.4v. I find that a charge lasts longer on the Eneloop than the alkaline batteries, and I use the 1900ma version not the more expensive ones. I'm a caver and light is super important, I've been using the same set for over a year and they are still going strong. I's also important that you get a good charger. Don't bother with the ones included with batteries, they just ruin your batteries. La Crosse is a good solid brand.
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