Quote:
Originally Posted by Weasel
Odds are it is overcharging/overworking the battery causing it to boil over. The wal-mart battery probably doesn't match the AH and RC ratings needed even if the CCA is high enough. BMWs have extensive electronics that take alot of power, and we have 120 amp or higher alternators who's output is controlled by the DME to keep it charged. I think that wal-mart battery is just overloaded by the electrical demand.
And thank god you put the vent hose on or all that acid would be in the rear cabin eating away at the electronics in the back, especially the stuff in the tub with the battery...
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This morning, I found out the battery was discharging through the vent tube. Bottom of my tray was dry.
The new battery is a EverStart Maxx-49 series, as recommended for the 2004 4.4i. Ran back to Wal-Mart - needless to say it was quite the experience. The initial recommendation was to leave it - if it failed they would replace it, they said. I replied - What about all the acid that is pouring out of my vehicle? Queue crickets...
They agreed to replace the battery - I thought maybe I had a bad battery (I know - bad assumption). Sure enough - the second new one is doing the same thing - still dumping acid; in the garage, in the driveway, everywhere. Not good...