![]() They should also be simple and intuitive to use. Look and feel: Ideally, we think rechargeable battery chargers should be compact and unobtrusive, since they’re commonly used in high-traffic areas like your living room, office, or bedroom.Extra features: We considered any extra features, such as a USB port or display screen, and noted whether they made the charger easier to use.We set them to discharge at a rate of 1,000 mA per hour until they died and then recorded the time elapsed and capacity (mAh) measured by the Advanced Battery Charger as the batteries went from fully charged to fully dead. Capacity: After fully charging each pair of batteries in their corresponding chargers, we stuck them into a Powerex Maha Advanced Battery Charger.We wanted to confirm that each charger could charge a single battery at a time, since some (especially older) models can charge batteries only in pairs. We inserted a single battery into each charger and waited to see whether it began to charge. Individual charging: This test was simple. ![]() Less than $50: We ruled out any models costing more than $50 because we know from past research and testing that you can get a good charger for much less.This helps us gauge whether the company makes high-quality products, if it will be able to keep items in stock, and whether it has a dedicated customer-support team. We also perused each company’s website, read user reviews and ratings, and (when applicable) ran the Amazon listing through Fakespot to confirm it’s a reliable seller. 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. ![]()
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