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

The red light turns on when plugged in but no green light comes on to indicate full charge. They do not last as long as their standard counterpart. The customer service is great. The seller reached out to me after my initial feedback to try to address my concerns, so A+ for that. I've updated my feedback to give them five stars. I use them in a medical device and they last about 4-5.5 days working non-stop vs. 2 weeks with a disposable battery. So for the price, they are a money-saver since I can recharge and reuse them - I just wish they lasted longer. I have noticed that with my particular device and these batteries, it will not indicate when battery level is low, just when they have to be changed.

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.

I received these a week ago and I have to say that the ease of re-charging these and the fact that you can re-charge anywhere there is a USB input make these the future of rechargeable batteries. no more "FINDING THAT CHARGER". And NO more having to charge a pair when I only need one battery, "Or any time an odd number of batteries is needed", as the "chargers", will ONLY charge in pairs as a minimum. And the fact that each battery has the red/green LED lights for charging is a great bonus also.I only gave this review "4 stars" and not "5 Stars" because I have not had them long enough to know how they hold up under constant use and re-charging. BUT If they do? These are the future of re-chargeables NOW!!! Without a doubt!

I needed exactly 4 batteries to power a trash can with a motion detector. Many comments were complaints about having to buy copious amounts of replacement batteries. Rechargeable batteries are the obvious solution.Not only do these batteries solve the problem but they also eliminate the need for a dedicated charger. Since they plug right into any available USB outlet I can simply plug them in as needed . I have charged them once and it took about an hour. So once I figure out how long a charge lasts, I can just plug them in over night. I am impressed.

Las baterias tienen un concepto muy innovador, sin embargo, creo que faltan mejoras.La duracion de la bateria es mas baja con respecto a unas baterias normales o alcalinas, pero cumplen su funcion como es debido. Buen producto, pero no es buena compra. Aun asi, deberias darle la oportunidad de probarlos, ya que no siempre se tienen baterias recargables en casa.

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.

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.

Disappointed in these batteries. I love the concept of 1.5 volts instead of 1.2 NIMH, but these have not tested reliably. I have 8 of them. I'll charge them up and test them on a nice load tester which I trust. One or two each time will not show any charge at all. Later, same batteries will show full. I put them in the game camera and check it a week later and only one or two pictures are taken because the batteries show dead. I bring them home and test individually and a few will have no charge at all again, but others are still full. I mark the bad ones and charge and repeat and different ones will show no charge this time. Weird eletrical glitches. Batteries you can't trust are worse than no batteries.