On the positive side, this charger is relatively compact and sleek-looking, and we like its flying saucer–like shape. With a listed charge-rate range of 300–400 mA, it’s less than ideal for charging AA and AAA batteries (which need 1,000 mA and 500 mA, respectively, to charge optimally). Even when these ports were not in use, our batteries charged so slowly in testing as to make the charger impractical. It has two built-in USB-A output ports, so you can charge a phone and another small device simultaneously, but they’re so low-current that your devices will charge at a snail’s pace-especially if you’re charging batteries at the same time. The EBL FY-1602 is the best 16-slot battery charger we’ve found, but we still don’t think it’s worth buying. We took these factors into consideration as we tested-and spent lots of quality time with-all 14 chargers. 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.
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