USB Rechargeable AA Batteries - Lithium Batteries Cell (Built-in Charging Circuit) - 1.5V / 1200mAh (4-Pack) Double A Li-ion Battery

This USB AA li-ion batteries are rechargeable and easy to use. I just need put it to my computer USB port or my power bank USB port to charge without use battery charger. It did quick fully charged less than 2 hours. The main point to use this kind of batteries is SAVE EARTH instead of thrown away Alkaline batteries made wasting resources all the times. I like it and very useful for me!

So why would I give this product 3S for Value, 4S for Life, and 3S for Dur, and still rate it 5S? They are expensive for rechargeable bats. They are a little short life then a regular bat but charge faster. And I am not a fan of the bungie head attachment on the + end. I get the reason why they did it. But a MAG LOCK would have been better in my opinion. So why 5 Stars? Because USB charging ports are everywhere now, and I go through a lot of antiquated batteries. This is an awesome product and I wont knock them for my opinions on how they could make it better.

These batteries have been a solid purchase thus far (~1 month of use). The charge time is truly an hour as described, and the batteries last a long time per charge (used in Xbox 1 controller). I haven't done a true timing measure, but the battery life feels similar to conventional batteries. One note though: these batteries don't report live battery life very well, they reported full battery life up until the moment they ran out of juice - so I never got a low battery warning from the controller. So just be prepared for that. The blue tops that covers the USB port feels a little light, but as of now the batteries have performed as expected.

Really clever item. Four per pack, so 2 charge while I'm using the other 2. I have been using them in an XBox controller. Charge lasts at least as long, maybe longer, than standard non-rechargeable AA batteries. Not sure about the longevity. I've only recharged each set twice at this point.

Batteries arrived well packaged, but one of the four batteries was DOA, with an initial charge but doesn't recharge. I can still use the three working batteries, but the fourth is just dead weight at this point.

These batteries are not there yet. I bought then to power LED string lights. The lights stayed on for only few hours when powered by these fully charged batteries. I experimented twice: fully charge all four batteries and then powered the lights. And twice the same frustrating result. The same LED string lights stayed on for weeks when powered by Duracell batteries. I read reviews that pointed out these batteries do not last as long as Duracell batteries, which is not a big deal since they are rechargeable and are USB based (no need to buy extra charger). However, I did not expect to have to charge them every day. Additionally, these batteries spent more time being charged then actually powering the LED string lights. Returned these batteries after using them for two days and I am back to Duracell batteries.

First, what a great concept! Having a battery that you can recharge by plugging the battery itself into a USB port is genius. These batteries are great, and a must-have for people who travel (you have to take them on planes in your carry-on, since they're Lithium-ion). How many times has your mouse you use with your computer just died and you didn't have a spare AA battery? Pointer sticks for sales folks die at the wrong time. And just being able to recharge quickly AA batteries without pulling out the charger just to do one makes these essential.

Only buy this if you don't mind being an early adopter. 2 of my 4 batteries don't hold a charge after only 2-3 uses. The other 2 seem to work fine. I do like the all-in-one factor. There's no separate charger and they are a nice conversation piece. But these are not reliable enough to depend on for travel/backpacking/cave exploration etc.This is fine for a wireless mouse at the office.