Review on Rechargeable AAA Lithium Batteries With Micro USB Charging Port - 1000 Cycle, 1.5V/400MAh - Pre-Charged, 4/Pack by Tiffany Smith

The 4 pack is awesome, for testing purposes though, I have only been using the same 2 batteries in my mini maglite for almost 2 years (the other 2 are used randomly in the house) and have charged them over 50 times. When using the flashlight a lot I can get two weeks from a charge and have they sat unused for months and still had adequate charge left. The charge doesn't last as long as alkaline but, on the other hand, I haven't bought batteries for my light in two years. It takes about 4 hours to charge from completely dead. They make the flashlight as bright as a "fresh out the pack" pair of alkaline batteries and they stay that bright. They don't dim the flashlight as they discharge like the alkaline do. The flashlight stays at peak brightness until the batteries are fully discharged and the light goes completely out. I keep a pair of alkaline batteries in my toolbox at work for when the light dies and I'm needing to use the light and cant wait for them to charge. When the batteries are done charging they go back in the light and the alkaline go back in the toolbox.