I bought the 4-pack of Pale Blue Earth's AA batteries about 2 months ago. In that time they've proven to hold a charge and recharge insanely quick, allowing me to put them back to use sooner rather than later. Not going to lie, I don't use them to power a drill or any other robust tool for my manly-man hobbies. I use them to power my xbox controllers. They don't seem to last as long as other, more conventional, batteries that I used in the past, and due to them being Rechargeable Lithium I don't get a heads up notification when they're about to die, so I've had to change them out in the middle of a game more than a few times. However, the fact that they consistently recharge and I will get more life out of them in the long run than I will a non-rechargeable battery is worth it. More bang for your buck easily.