If it drains when its sitting then there is a slow drain somewhere in the electrical system. The question is have you installed anything electrical in the car rescently? Or has something stopped working rescently? Often there is a more visible related problem, finding electrical drains can lead to insanity. Did the last battery also go in one night, or over a period of time? Could be a brand new bad battery, I have gotten them before. Batterys ussually have a code on the side of them somewhere that says when they where made. Now the parts dealer shouldn't have a battery sit on their shelf for more than a month. The codes work like this- the letter is the month the number is the year. So if your battery says I2 on the sticker, then I=9th letter=september, 2=2002, so I2 would be a battery made in September of this year, and thats ok. But if it had like an F2 thats July of this year, and I would go into the parts store and pitch a bitch about shelf life and their irresponsibility. I once was offered a Sears battery that was sitting for over 6 months, and I laughed my ass off, and gracefully declined.
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