I have 26 scanners that my employees use. At the same time I installed into half of them with these batteries all fresh from the box and the other half with fresh from the box well known brand batteries. At the battery station there is a old battery box they put the dead ones in. Today all but two of the batteries in the box are these batteries and the A/C Delco new battery box is getting empty. I bought the 100 pack of these in AAA size and I use them at home with things here and there and I am replacing them all to fast. I have noticed they have a surge of power at first but quickly drop in power and then just drag on.