Fishy battery issues.... - PeachParts Mercedes-Benz Forum

pawoSD · #1 03-13-2007, 06:19 PM

I took my old DieHard International 100Amp 805CCA battery (which left me stranded) to sears today to get it tested/refunded/changed out...whatever they'd do....so he takes it, brings it back and says it is charged and passed the tests fine. I think this is a load of ####....as the thing left me stranded in KY Saturday with barely enough juice in it to make a light bulb glow.

MB tech installed a new battery in my car (thank heavens for the roadside assistance) at the cost of $142....started up the car, low and behold its showing 14 volts like it should, drove around for a while, stayed at 14v even with the headlights, radio, and blower all on, just above 13V at idle with all that stuff on. Days later here I am, it still goes to 14V when running....and has held the charge fine. I say the DieHard battery crapped out, what do you all think?

Also, back in February I had a day where it was -10 outside and I glowed for about 25 seconds, then cranked for about 9-10 seconds, at which point the battery was dead, no go. So I tried jumping it with another car for 20 mins of charging then attempted to start....no go...so I went and bought a mega charger/starter....charged it for 20 mins at 15A, then flipped it to 100A start mode, cranked the car right up and all was fine...until this incident that took place Saturday....went from 14V to 12V while driving....randomly for 5 mins during the trip it went back to 14V, then fell to 12 again and never went back up. Any ideas on what might have caused it? I still say the battery is bad....10 seconds of cranking is wimpy, when the battery was new I could crank for 25+ seconds without even wearing it down.