BLACKUBE AAA 600mAh/900mWh Rechargeable Lithium Battery- 1h Quick-Charge by Micro USB Cable -1.5V/1000Cycles - 4Pack Triple A

I have a bunch of NiMH batteries. And for a lot of things they are fine. But you have to charge them in pairs. They take a long time to charge and they slowly fade away. Not great for devices that use 3 batteries. Or something that you need to supply with a constant high power. I bought a bunch of these for use in under cabinet lighting, and aquarium gravel vac, and my wireless weather station. The under cabinet lighting, just sucks batteries dry. And these are no different, in fact in that application they don't last nearly as long as alkaline or NiMH. But they do stay brighter longer. The gravel vac is the same situation. The fade of power made it frustrating to use. These are constant. Full suction all the time. If they do die, there's just no suction at all. It's a very clear indicator. And charging doesn't take 8 hours. plug these into a USB port and they are good in an hour or two. Finally, the weather station. It seems like those batteries are always freezing and dying or over heating and dying. These are less sensitive to temperature swings. And recharging 3 of these batteries is so much easier. I don't have to cycle them through the charger like I would the NiMHs. NiMHs don't like it when you pair a dead battery with a fully charged one. These don't care. You can charge 1 or 3 no problem.I'd love to see a longer run time but the charging convenience and steady power more than make up for their weaknesses.One thing I would really love to see is a double length battery. Basically 2x AA batteries permanently end to end. Thus you could maximize the capacity and reduce the regulation/charge circuitry. My gravel vac uses these and the under cabinet light could benefit from them as well.

So far these are performing as expected. I enjoy the convenience of USB charging with no additional equipment required to bring like NiCd and NiMh technologies. You can charge at home, travel, car, camping (with solar USB options)There are two main advantages to these cells if you need AAA rechargeable.- very low self-discharge rate so using them long term in clocks or remote controls where you have low power use over a long time. These perform very well. Because of the low self-discharge, it also stores well and only needs recharging 6-12 months later. Other technologies would be long dead by then.- constant 1.5v for equipment that does not run well on the 1.2v rechargeable cells.the things to be aware of- they die suddenly without the normal dimming of regular cells. not a bid deal in many situations but not great for other situations where you need warning- lower rated capacity than non-rechargeable and NiCd or NiMh cells. Because of the low self-discharge rate of these cells, they will still beat other rechargeable cells because other cells lose charge that you can't use due to self-discharge- no rechargeable cell will beat a non-rechargeable cell. don't set that expectation.I wanted to buy more of these but the seller had a 1 per order limit.

These batteries are a compromise that reduces available capacity for the ability to recharge via any standard USB port. Make sure you know what you are getting before purchase, but they are pretty good if you understand the pros and cons.They hold less than standard rechargeable batteries, but you can use any common Micro USB. One thing I haven't seen mentioned is that you don't strictly need to use their 4-to-1 cable—regular cables work fine.I work somewhere where I need a small flashlight often, but not for that long at each use. I wanted to be able to pop out the battery and recharge it at my desk using the cables I already have. The constant 1.5V instead of the 1.2V NiMH gives you will provide a slightly brighter flashlight with a more consistent output.

So these batteries haven't had the best reviews. For this reason I have held off on buying these until they showed up as a Lightning Deal two days ago. I own several other Blackube batteries and they are all great. So I figured for the Lightning Deal price I would give them a try.Unfortunately one of the four batteries was dead on arrival. The first three charged and worked no problem but the fourth would never light green from a full charge. So I used my battery tester on all four and one obviously doesn't work.I contacted Amazon Chat about the issue and they just gave me a full refund and told me I could keep the three that worked. I needed four to work for what I was going to use them for, but I guess I will hold onto the three for now.Again, other batteries from this company have worked great, but the AAAs just need better quality control I think.

I've only had these for like 2 weeks but so far they are pretty good, hence no rating on longevity. Put them directly into the remote and I could feel the immediate response compared to weak batteries. I bought a pack of 4, I use 2 in the remote and save 2 for when the active ones have been depleted. My only problem is the instructions requires the original usb charger to be used, not a generic charger.

I like how easy these are to charge, but they take a long time to top off and don’t have the greatest capacity. Unlike NiMH batteries, they don’t drop voltage as they run low, but when they run out, they go from full output to zero very quickly. Depending on your use, this could be acceptable or it could be problematic. They did stay charged well in sub-zero temperatures, which is usually a problem with traditional rechargeable batteries.

Love that I am able to get 1.5V consistently. Easy to charge by using a micro USB cable.

Love the usb batteries, so convenient to just recharge!

I am buying another set of 4 AAA and 4 AA. These batteries worked very well for the toy I brought them for. They lasted much longer than the cheap alkaline batteries we were burning through. They are a little expensive but the fact that they recharge so quickly and can be ready for use so quickly makes it worth that price. Look for a 0.5A USB charger and add it your order - that way you don't need to plug into a computer.

I decided to purchase these batteries for my portable electronics. I liked the overall attention to detail with the packaging and quality of build, the instructions were clear and they gave me a sense that the design and manufacturing was well planned. Unfortunately 1 of the 4 batteries did not charge at all. I contacted Amazon and they gave me several choices on how I wanted the problem solved...you can have confidence that all was taken care of.

--NOT A PAID REVIEW--I am writing this review on my own accord. I purchased two sets of these batteries for using with my Roland Mixer Pro which normally drains out 4 batteries normally within a day or two. Unfortunately the mixer does not have a provision for an adaptor and hence batteries are the only way to power it up. I recharged both the sets I purchased and true to claims they got charged up under an hour. It has been day 2 of usage and the batteries have not died on me yet which seems to be a good sign.Additionally the batteries also have a case of their own so that one can easily stow them away when not in use. I would give it a thumbs up as a bonafide product based on my experience.ThanksSunil