Passat (B5) :: 2003 1.8T - Battery Drain At Off


Aug 17, 2007

I have a 2003 Passat 1.8T. Over 8 Hrs the battery goes from 12 to 10V and the start is real sluggish. I'm going to test the load on the battery when it is just sitting there to see if there is a short somewhere. I'm wondering what the load should be from the clock and radio which draw power even when off.

It is 4+ years old so it might be just time for a new battery..... Alternator is working....14V on the battery when the engine is running...... so there is charge form the alternator.....

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I have another 2007 Prius here for body repairs so I took the aftermarket (newer) battery out of it and topped the charge off in it. The battery load test indicated it was still a serviceable battery.

Put it in the car and cleared the red triangle, etc.. Everything was fine.

Since I was still going to be short one battery, I contacted Battery Systems, my shops battery dealer and ask them to drop off a new Yellow Top Optima that fits the Prius (FYI my shop price is $159.96). I would be a couple days til their deliver truck would be here and again I left the car sit for a couple days and drove my truck. On the day of the delivery, I had an appointment and drove the Prius, about 15 miles. No problem. Left it at in a street parking space for about 2 hours. Came out and all systems were dead. Nothing. Dome light was the only indication that the battery was so low that it was very dim. Head light were off and I hadn't used them while driving.

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