KeenPower AA Batteries USB Rechargeable Double A Lithium Batteries Li-ion Battery Cell 1.5V / 1200mAH Not NI-MH/NI-CD/Alkaline Batteries ECO-Friendly and Recyclable No Memory Effect(4Pack)

I tried them in my Blink XT camera and it was already very difficult to put in because they are about 0.5 mm longer than standard AA batteries. The batteries were fully charged, but the camera was then offline the whole night. Tried with other rechargeable batteries and now the camera works again. Then tested these batteries and found only 1060 mAh capacity in it. Way lower than promised. The only positive things I've found is that they are quite narrow and charge fast, but with much fewer capacity and longer than standard AA they are completely useless for me. Returned.

I found these USB rechargeable AA batteries very handy. I have yet to be in a situation where the batteries have gone "dead" They are convenient to charge, will charge on a USB hub, or at least the hubs I own, and seem to hold a charge for a long time. They might take an hour to charge or more. Mine charge in minutes, but I don't drain them. The covers need to be set aside when charging so the included plastic box is a welcome convenience. The caps go on one way only since they are USB format. I think these are slightly pricy but OK for the value. You need to carry these onto the airplane and not check them. In the carrying case, there is no danger of short-circuiting and causing a fire pr a small explosion, but they are not marked on the battery as to chemistry and based on the advertising, should be treated as lithium. They do not act as NiMH batteries do.

I'm giving this 3 stars because the design and ease of use are really great. What isn't great, was the lack of power I got from these batteries. I fully charged them and used them to power EL wire. Normal AA batteries will power a strand for at least 8-10 hours. I have 8 of these batteries and they were all completely dead after 2 hours of use, leaving me in the dark. Yes, they work, but not for a long amount of time.

Do not use these in an AM radio---the internal DC/DC converters generate a ton of radio "hash" that makes listening to AM impossible.

Bought these because I only needed two for a low price. One for my wireless mouse and one for my trimmer. 1 week later and they still work great.12/9/19Use these almost daily, they still work great

I Really like this idea! I was disappointed in the longevity of the batteries; rather the lack there of! But they are awesome to use as backups. They do charge up rather quickly! The case is durable and much appreciated because I totally would lose the caps!Please continue to improve on the life of your product or at least come down on the price(perhaps a4pk instead of2😉)! I would be more than willing to purchase again or as a geek gift!

Great idea for a rechargeable battery - USB port built in. Initially I liked the removable magnetic top, so that you could attach it to the base of the battery when you were charging it. However, this also makes it easier to lose than if it had been a flip top (have already lost one). Then again, maybe the whole idea is for you to lose that part so they can eventually sell you replacement tops.

I am using these batteries in an AA powered professional aviation headset. They seem to have plenty of capacity, lasting almost as long as conventional alkaline AA batteries. They charge quickly in a USB port too, and the little green ring light around the top is a great easy to see indicator of charging status. So far they've saved me over $20 in disposable AA batteries with no issues. Recommended!