Kratax New Rechargeable Lithium AA Batteries 12 Count 1.5V Lithium ion Rechargeable AA Batteries with Low Battery Alert and 2H Smart Battery Charger, 3500mWh Long-Lasting for Household Office Devices

The amount of money I’ll save for my security cams not having to buy lithium batteries every other month

I use these on my Sound Devices MM-1 Preamplifier and my Transmitters! Having about 9hrs of Transmitter battery life is pretty great for rechargeables! Just wish they had more of a 10% battery life warning, but better than nothing. I also wish there was an 8 Bay charger instead of just a 4 Bay charger.

Thought these would be high quality batteries, wrong. I used them in my Blink outdoor camera, they died in 2 weeks of light use. After replacing with a fresh set, the short life of approximately 2 weeks repeated itself. Also, the built in feature that slightly drops voltage to give warning the battery is low never triggered. My camera just died unexpected. The batteries that come with the camera are rated lower but will last about a year. They are expensive but live up the expectations. Amazon was great in helping return these.Update: seller deceptively charged $14 restock fee for returning a couple days past the 30 day return window. Pathetic. Thank you Amazon for fixing this.

Used batteries for Blink cameras and they work wonderfully.

Charged well in provided charger, tested in wireless mikes. Works great so far.

Almost all of my doors have keyless entry systems and this was advertised specifically for smart doors. They charged pretty quickly though you can only charge four of the eight batteries at one time. They have held up so far and I just liked the security that I'll always have AA batteries for flash lights in an emergency. I invariably am out of whatever battery I happen to need.

I have replaced all my alkaline batteries with rechargeable batteries for convenience and to be environmentally friendly. I have been using Eneloop Ni-MH batteries for a long time, but this is my first experience with Lithium AA batteries, which are essentially 3.7V Lithium batteries downvolted to 1.5V.Compared to Ni-MH batteries, Lithium batteries are known to have a higher capacity, more charging cycles, shorter charging time, and greater discharging current. The main drawback is their sudden loss of power. Lithium batteries run at 3.7V and use voltage regulator chips to achieve a 1.5V output. The chip will maintain 1.5V as long as the battery voltage is above 1.5V. However, for Lithium batteries, 1.5V is well below the safety voltage, so another chip cuts the power before the voltage drops to 1.5V, leading to a sudden loss of power without warning. This product addresses that issue!There is one caveat, however. The charger that comes with these batteries operates on 5V (as indicated on the charger). I forgot the exact voltage I measured, but it was above 4V when charging. You should NEVER use this charger to charge Ni-MH batteries! 5V is also too high for MOST Lithium batteries without a protection IC. Unless you know what you are doing, NEVER use this charger to charge any other type of battery. ONLY use it to charge Kratax batteries.This also means that if you use your old Ni-MH chargers to charge these batteries, they won’t work. However, finding a replacement charger shouldn't be too difficult if you lose the original one: any charger designed for 3.7V Lithium batteries should work, provided the batteries fit.These batteries are slightly lighter than Ni-MH batteries. The build quality is good, though not as outstanding as Eneloop. The capacity is 3500 mWh, not 3500 mAh. For comparison, the standard white Eneloop is 2100 mAh, which, multiplied by 1.4V, equates to 2940 mWh. The black high-capacity Eneloop version has 2600 mAh. Therefore, this battery has a higher capacity than the white Eneloop but slightly lower than the black high-capacity version.So, what to choose?Buy these instead of Ni-MH batteries if you need a high discharge current for devices such as bright flashlights, Xbox controllers, cameras, toy cars, devices with motors, walkie-talkies, and radios.Conversely, Eneloop Ni-MH batteries are known for low maintenance and they do not deteriorate if kept at 100% charge. Thus, they are more suitable for low-energy devices like clocks and remote controls. For TV remotes, I might opt for cheaper Amazon Basics Ni-MH batteries instead.

I've been using these batteries for some electroluminescent wire, and they work quite well. They last fairly long, though of course not as long as non-rechargeable alkalines do. The charger is perfectly fine, but they really cranked up the brightness on the backlight - you really don't want to have this in your bedroom at night. Still, it's a responsible and economical alternative to disposable batteries.