The first factor relating to the overall life of your battery relates to the question ‘Should I charge my battery before I use it?’ and ‘How long should I charge the battery for?’ and the answer to these does not have the impact it used to have. Today most Lithium-Ion and Ni-Cad Batteries, which are the main types for cordless power tools come with a little bit of charge. It is recommended to charge prior to using it, and I would recommend taking the battery off when the light indicates that it has charged. Leaving it on can be a problem too, and relates to the second factor in increasing your cordless drills battery life.