I have recently bought one cordless drill. I have some queries regarding maintenance of two 12 volt Bosch batteries which are for cordless drill. Do the new Bosch batteries come in discharge condition? Do I need to charge them before use? How can I charge it to get the best possible outcome? 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 Bosch drill batteries? Can you guys help? Thanks.