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equ · 02-28-2015, 07:32 PM

The weeks of snow/ice/salt enforced parking took its toll on the m3. Car didn't start on Thursday evening. I jumped it, drove it for 45 minutes.

It started on Friday evening, but this morning I took it Advanced Auto Parts. They measured 12.2V, 600CCA@26F. So that's 45 minutes of town but a bit revvy driving a day before and 8-10 minutes just before the measurement.

Battery is a Bosch 48-690B, rated 850CCA@32F, 690@0F. Interpolation gives me 820CCA@26F, so it was slightly below 75%. Since there is no plug/outlet that I can use in my condo garage, I pulled it from my car, brought it home and plugged it to my delran motorcycle tender/trickle charger. It might take a whole night or even longer for it to properly charge.

1. Will this battery fully recover?

2. If not, any recommendations on what to put in? This was about a $145 battery that the previous owner installed in 5/2012, so it has not even been 3 years. Since then, car has done about 8-9k miles (almost all with me). The bosch weighed in at 38lbs, I wouldn't want to go heavier, though I have no use for a light/racey battery.

02-28-2015, 07:32 PM	#1
equ Alphanumeric Join Date: Aug 2005 Carmudgeonly Ride: 981S, 340i Posts: 9,584	Dead battery on the e46 m3 The weeks of snow/ice/salt enforced parking took its toll on the m3. Car didn't start on Thursday evening. I jumped it, drove it for 45 minutes. It started on Friday evening, but this morning I took it Advanced Auto Parts. They measured 12.2V, 600CCA@26F. So that's 45 minutes of town but a bit revvy driving a day before and 8-10 minutes just before the measurement. Battery is a Bosch 48-690B, rated 850CCA@32F, 690@0F. Interpolation gives me 820CCA@26F, so it was slightly below 75%. Since there is no plug/outlet that I can use in my condo garage, I pulled it from my car, brought it home and plugged it to my delran motorcycle tender/trickle charger. It might take a whole night or even longer for it to properly charge. 1. Will this battery fully recover? 2. If not, any recommendations on what to put in? This was about a $145 battery that the previous owner installed in 5/2012, so it has not even been 3 years. Since then, car has done about 8-9k miles (almost all with me). The bosch weighed in at 38lbs, I wouldn't want to go heavier, though I have no use for a light/racey battery.