There seems to be quite a bit of interest in fixing cordless drills. Even I have done one instructable on the topic ( which I will put first here! otherwise no particular order ). Most of the fixes involve the battery: some replace it, some soup it up. This guide will help you find many of the instructables in one place. If you have an instructable on this topic and I have missed it please let me know. If you would rather junk the battery and add a cord see: There are other things you can do with your cordless drill, more guides coming, one covers running the drill without the battery: Cordless Drill Repair - Add a Cord. And for even more drill stuff see Cordless Drills - a Collection of Collections.