When it comes to rechargeable batteries, there are two types of people: the first buys into the idea, doesn’t mind paying extra for the benefit of reusing the same battery, and probably has an eco-warrior edge to them.
Everyone else takes a “whatever” approach, buys traditional disposable batteries, and is pleased with their low cost and plentiful power.
Seeking to bridge that divide is a new generation of rechargeable battery with super-low discharge (SLD) technology, like the Sanyo Eneloop batteries.
Traditional rechargeable batteries only hold their charge for a short period of time, meaning when you need the battery most it probably doesn’t have the charge you’re looking for.
But batteries with SLD only lose about 10 percent of their charge every 6-12 months, meaning you can store them away and not worry that they’ll be dead when you need them.
or if you want a charger than can switch-hit and more, pick up the La Crosse BC700 for around $25, which can charge AA and AAA sizes at the same time and gives you real-time charge info, too.