TENAVOLTS 1.5V AA Lithium Rechargeable Battery, 1.8h Fast Charge, USB Charger, Constant Output at 1.5V, 2775 mWh, 2 Count with Charger

I use these batteries with my insulin pump. Compared to the Energizer Ultimate Lithium, these are by far superior in charge retention and longevity (Energizer will last no more than 21 days). As used, one of these batteries can last with multiple use, all day long and for up to 22 to 25 days without a recharge. That along is impressive. The design of the charger is flawless. It detects each battery charging stage and allows to charge from any USB port available. It has a two lights system, one to show that is connected to a power source (neon green) and another to show when the batteries are fully charged (led blue) the whole thing is very light weigh and compact, portable, and a 3 years old can manage it's use. Excellent fast recharge time for the hours ofor use. No other rechargeable battery in the market will work with my medical insulin pump because it's internal battery detection system will reject it as a faulty battery. These, on the other hand, work better than the regular ones (more expensive) the pump manufacturer recommends. The pump even detects when the charge is low giving me the time needed to swap it for the other one kept in the charger. I have no words to express how grateful I am to Amazon (for carrying the line of quality products) and to the product manufacturer for making my life a little easier and safe me money in the process. THANK YOU.

I've had these batteries for about a month now in my Bluetooth mouse at work and I havent had any issues with them yet. A Bluetooth mouse isn't very energy hogging so I cant speak to its capacity with use in something like a flashlight like other reviews. In my mouse however, it has yet to need a recharge even though a lot of times I leave the mouse on over night. When I test the batteries with my multi meter they still read a little over 1.5V. Based on other reviews I've read, I think i have the perfect use case for these batteries. The price is a little steep for what you get but seeing as I got these to test in return for my honest review, I cant complain. Overall, I do think they have worked well for me so far and I will update if anything comes up.

I liked that these batteries are simple to use. I have no problems with them yet. The lighting for the battery charger easily indicates when they're fully charged or in the process of charging (No light means it's charged and a light means it's still charging). Batteries can be charged as long as it is connected to any USB port available. As a college student, I always have my laptop on me so if I ever needed to use the batteries and they needed some charging, it's really convenient. A little pricey for some batteries, but they work great.

would prefer a special charger was not necessary, but they do work ok, Since the charger only deals with two batteries at a time, I found myself having to focus too much on battery changes, frankly, which became a pain in the butt. I wound up purchasing a headphone amplifier that plugs into usb, so I don't have to think about batteries.

First off, the size of the battery is exactly the same as normal AA batteries and seem to be of good quality. I checked the voltage after fully charging them and got 1.508 & 1.509 volts on a meter. It's a little strange in that the light on the charger represents the statis of the charger and there are lights at the bottom of the batteries that are on when charging and shut off when fully charged. I used the batteries in my flashlight and could not see a difference from regular AA alkalines. The charger seems cheaply made, but worked just fine and took about 2 hours of charging when first received. I have only had these for a couple of weeks but they are doing well so far.

With the price difference the batteries and the batteries with a charger you would think this must be a good charger; but it is just a light weight piece of plastic and the USB recharge cable sent with it is junk, no adapter for a wall outlet and it would take forever to charge from PC USB. And what kind of USB A plug is this on here anyway? It looks like half a USB Male socket with 4 exposed pins, I think it might be USB 2.0 it is definitely not USB 3.0 and I doubt that it is fast transfer either. I am just going to use my own cable.

For anyone that has never tried using rechargeable batteries before, let this be your open door into the world of re-usable batteries. They are very convenient! Yes, these may seem a little expensive for one set. And yes, you'll need to purchase a charger if you don't already have one. But what if I said you won't need to buy batteries for many years potentially with these (depending on your usage, of course). You will be all set! Charging doesn't take that long, and these last nearly as long as a typical set of batteries. The cost savings will really add up over time.

I had previously ordered the 4-pack version of these batteries and chargers. So I had high hopes for this compact charger and two batteries to carry while I am travelling. Unfortunately, one of the batteries does not hold the charge and that defeats my purpose of having a backup set of batteries while travelling. The charger shows charged status and then in a few minutes, it keeps charging this defective battery. I also swapped the chargers to ensure it was not the charger. Now I wonder if all the batteries will deteriorate unpredictably or did I get a bad battery? I will reach out to the manufacturer and update this review.