High battery-capacity rating: Keeping in mind that a battery’s true capacity is often lower than the rating on the box, we wanted to restrict our search to options with high battery-capacity ratings.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.
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