The car is a 2000 Mitsubishi Eclipse GT. A couple of months ago, I had to put a battery in the car. The battery I replaced was over 2yrs old. That morning the car would just barely start. I used my voltmeter and the the battery was showing 10.9 volts. With the engine running I hd 14.5volts which tell my the alt is good. I drove over to Advanced auto and the guy there said the battery was basically dead. The battery was replaced. 2 days ago the car wouldn't start at all. Again I used my volt meter and the battery was showing 11.5 volts. This time I had to jump it to get it started. We decided to take the car to the local Mitsu dealer. I told the guy that I thought there might be a slow battery drain. I told him according to my scan tool the alt was putting out about 14.4volts. We both agreed that the alt was good and working. Anyway, the dealer couldn't find any evidence of a battery drain. We replaced the battery. This battery was only 2 months old. I know it's possible to have a battery go bad but I like to rule it out. What's the best way to find a slow battery drain? I read several way to do it. My question is, does the computer use any voltage while the car is off? Thanks for the help. Pearl02.