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Nimh aaa rechargeable batteries8/3/2023 ![]() This feature can cost a premium, but we require it for every model we test because we’ve found that some low self-discharge batteries are still usable after several years, as opposed to months, in storage. However, some batteries are designed to have a lower self-discharge rate than others, and they are marked as such. So just because you fully charged a battery yesterday doesn’t mean it will still be 100% charged today. Marked “low self-discharge,” “LSD,” or “pre-charged”: All rechargeable batteries experience some amount of self-discharge, which means that as soon as they are fully charged, they start to lose a little bit of charge.But the number of rated cycles signals how long the battery was made to last. Keep in mind that your batteries will likely perform worse after a handful of years, regardless of the number of times you recharge them. But in order to find those that can last the longest, we considered only those models with cycle ratings in the thousands. Rated to withstand at least 1,000 cycles: Some rechargeable batteries are rated to last hundreds of cycles-a battery cycle is one full charge and one full discharge.(Just remember to take them off the charger once they’re charged to avoid damage.) Since our favorite charger can handle up to four batteries at once, for this guide we preferred brands offering packs of eight batteries (or four, so you can easily buy two packs at once). Available in packs of four or eight: We recommend getting twice as many batteries as you actually need, so you can charge one set while the others are in use. ![]() However, lithium-ion (Li-ion) rechargeable batteries offer certain advantages in some cases, so we also tested them for people who need the extra voltage they provide (1.5 V compared with 1.2 V).
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