I have a Hammer/Driver Combo Kit. I returned the first kit because one of the batteries was bad. One of the batteries in the replacement kit was also bad. Both batteries are doing the same thing. The battery is showing fully charged on the charger. When I plug it into the drill and I start using it if I meet any resistance while drilling the battery will just die and start clicking. There is no time frame of use either it could happen within a couple of seconds or a couple of minutes just depends if If the drill starts to work a little harder. The other battery works great no problems.