![]() Good reputation: We considered whether we had heard of the company or tested its products in the past. ![]() Informative interface: We required that every model have some kind of indicator (either a display screen or lights) to signal when the batteries are charging and fully charged.(You should still take your batteries out of the charger within a day of charging them, though.) Auto shutoff: We made sure chargers have a mechanism to automatically cut off power after the batteries are done charging and when no batteries are inserted.Individual charging: We ruled out chargers that charge batteries only in pairs, since we think it’s important to have the flexibility to charge just one battery or other odd numbers.We think most people will be set with a four-slot charger, and we preferred each eight- or 16-slot charger to be as compact and unobtrusive as possible. No more than 16 charging slots: The size of your charger will depend partly on how many batteries you use.If those chargers can also handle rarer sizes, the more the merrier. AA and AAA compatibility: We considered only chargers that can charge both AA and AAA batteries, since they are most commonly found in household devices.We did not require each model to have lithium-ion (Li-ion) rechargeable battery compatibility, though we gave preference to chargers that work with both types. NiMH (nickel metal hydride) compatibility: We made sure the charger was compatible with NiMH batteries, which generally have higher capacity ratings and more reliability than other common types of rechargeable batteries.
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