I have a C3 1/2 inch impact driver. It's less than a year old. I've used it a few times, but most recently I tried to use it to break loose one of the locknuts off a newly installed radiator core support bolt. It couldn't do it, so afterwards I replaced the lock nut with a standard nut, and even then after breaking it loose and retightening it a couple of times the battery went dead after trying to loosen it the third time. I wasn't surprised it could not bust it loose because my air impact couldn't either, but I wasn't on the trigger for a great length of time, maybe 10 or so seconds before realizing the lock nut wasn't going to come loose with about 3 or 4 attempts, and then the battery was dead, and I literally took it off the charger before I started? Does that seem like poor battery life? I've taken to keeping my batteries and charges in doors rather than expose them to cold during use, but it seems like the battery dies really fast on these units, especially compared to my much older 18 volt Ridgid batteries (which can usually go most all day with the 1/8 impact and matching hammer drill.