I have recently bought a battery operated cordless drill. I have some queries regarding its battery maintenance. Do the new cordless drill batteries come in discharged condition? Do I need to charge them before use? How can I charge it to get the best performance out of the drill? Should I charge it completely and then use it or should I first use it and then charge it? Also if I am not using these batteries for a long time is there any possibility that they will get defective? Also tell me how to clean these batteries and what is the best storage condition for these drill batteries?