Background: I frequently make international business trips lasting many weeks or months and carrying lots of batteries for my collection of electronics is inconvenient.Pros. These batteries fit and work perfectly in devices needing AAA batteries. They only need a standard micro-USB cable to charge. A cable that can charge 4 batteries at once was included. Charging time is fairly short, seems to be less than 2 hours.Cons: A trade-off for the built in charging port on the battery is that there is less room in the battery case for actual Li polymer so they do not have a lot of capacity. In my experience they only last about 20-25% as long as an alkaline battery would last in the same application.Verdict: For my situation and uses they are fine and I am glad I bought them. If you have electronic devices that require lots of power they may not have a long enough use time to satisfy you.
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