USB Rechargeable AA Batteries (2 Pack)

One works great, and the other just needs a tiny folded piece of aluminum foil stuck to the end of one contact on the side of the cap, because the contact isn't quite long enough to close the circuit inside the unit. And then that one works great too. (Knocked off two stars for that, though... Greatly affects usability for the average buyer!) Battery life is as expected: in my mouse it's noticeably shorter than a name-brand non rechargeable battery, but I just charge them when I swap them out, and right up until the mouse power indicator turns red, they work great. And I'd probably buy 'em again all the same.

I've used these batteries since last year in my  Kensington Orbit Wireless Trackball Mouse (K72352US) . Every once in a while one of the batteries doesn't hold charge, but then after recharging they both seem to work well for another month. It's very convenient to be able to charge these batteries by plugging them into the many spare USB ports on work computers.

Love these things. Using them for all my peripherals at home. And since everything has a USB plug these days I can charge anywhere. Battery life isn't spectacular but it's perfectly adequate. The end caps on a couple are finicky but no showstopping problems with them.

Poor quality, long time for item to ship and reach destination (me), will definitely not buy again and would not recommend!

7/26/2016 Functions well but VERY POOR design/construction, absolutely flimsy. Falls apart easily. Better suggestion is the Smartoools battery system: has a USB port on its side, just plug a cable into it. Highly functional.

Works as expected. The connector between the cap and the unit does seem a bit flimsy but seems to be ok, just don't be too rough with it.

Great concept - the charge capacity is less than something like an Eneloop so they seem to drain about twice as fast. I use this in a wireless mouse and find I have to change the battery every 2-3 weeks. No big deal, I keep the other battery charged up and ready to go. It takes about 4 hours to recharge when empty.This is a great concept for me - I work in a mobile office environment where I have to carry my entire office around with me. Not having to carry a charger is a great help.Oh, one time when charging, the metal USB connector separated from the mouse and got stuck in the computer. I pulled it out with needle nose pliers and superglued it back onto the battery. No problems since then.

batteries didn't work. I had to keep pressure on them for them to power devices. Tested in multiple devices. They did not make proper contact as normal batteries worked fine.