EBL 1.5V AA Lithium Ion Rechargeable Batteries 3300mWh High Capacity - 4 Pack with Micro USB Cable, 2 Hour Fast Charging - Perfect for Cameras, Game Controllers & Smart Home Devices

I think the coolest thing about these is that all 4 batteries can be recharged simultaneously with the included cable. I also liked the color change when the batteries were fully charged, from red to blue, with over-charge protection you can just plug 'em in and walk away...sort of like set it and forget. I use these in our battery powered drapes which don't require constant power unless in use so we'll have to see how long they last or what sort of power leakage there is. So far, very satisfied with this purchase and, if they pass the test of time, will be buying more.***UPDATE***EBL contacted me in response to my experience. They replaced the batteries which are working fine so far. Not sure if they will last, as the one's I used before only lasted a few months. But I changed my rating from two stars to four because of their prompt response. We'll see how this works out!I tried using these for an ADT door lock, since I spend so much on AA batteries. These give mediocre performance. No longer useable after a few months. Still looking for rechargeable batteries that work!I like the rechargeable lithium ion AA batteries. Huge improvement over any of the other options. I'm only on my first charge but will say that they have already done a great job in the motion detecting night light for which I bought them. Time will tell if I love them or not.Bought these for my wireless key board. these work well, but the keyboard is a vampire for batteries!I haven't tried them yet but, so far, charging them can get pretty hot, can't tell if it's fully charged, the blue light never comes up, and it just stops charging, but they are working and have power based on the battery tester.I like to give 5 Star reviews when products exceed my expectations in some way. With these rechargeable lithium batteries it is the way you can plug in the 4 wire USB cable and charge them all at once while the LED indicator switches color so you know when it is fully charged. The small slot to plug in the mini USB end is the inventive design I like the most and how inventors think up smart ideas. I'm old school and recall the days of carrying huge rectangular 9 volt batteries in a flashlight that went a few hours and was done. You have to throw the battery away. It probably weighed a pound or more and is still degrading in a landfill 50 years later. I'm going to order more of these and not buy the mega 28 pack disposables any longer. These can charge hundreds of times or more.I bought 3 sets of 4pcs, rather than 2 sets, due to a couple other reviews explaining that their order had at least 1 bad battery in the bunch. Well, I did get 2 low-ish capacity batteries that don't work for very long at all. I was tempted to return one set with the 2 bad batteries, but I found a good use for them. The other 10 are fantastic. I measured charge capacities and made a few battery drain tests using certain applications that had a fixed battery pull, and I would log the running times of each battery I was testing (including a couple of 1.2v NiMH AA's that I've had for a few years and also a couple of Rayovac High Energy batteries). The results showed that the Rayovac alkaline batteries were almost twice the running time than these rechargeable lithiums. But for high-drain devices, such as the 9 AA high lumen count flashlight pictured, these are far superior by how much longer they last in contrast to both the alkalines and the NiHM rechargeables, and by a pretty significant margin--mine lasts around 30% longer than Rayovac/alkalines.Not to say they're absolutely bad for lower discharge applications like a remote control or a PC mouse, but they are better suited for medium and high drain. I'm considering getting a couple of sets of these in other sizes, but first I want to wait to see how they keep up for a little while longer. And after about a month of regular use, they're holding up just fine. I love these batteries. Always comes in handy and quick to charge and 10/12 of them charge all the way up to the designed capacity, which is really nice. The other 2 hold about a third to possibly only half of the designed capacity. I certainly recommend these.The tiny charging system is not the most convenient; you need to attach each little wire into each battery. However, 2 batteries, on one charge, have lasted well over a month with my Amazon Blink Video Doorbell. These are much cheaper in price compared to buying new lithium batteries each time they need replacing.