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Car Forum / Chevrolet / Chevrolet Corvette / February 2009C6 Z06 Battery Replacement
My battery in my 2008 Z will not start the car after 5-7 days of the car sitting idle. The service rep at Chevy says that's typical of GM's with lots of electonics. He mentioned the Cadillacs have the same problem. They checked the car (they said) for parasitic draw when the car was off and it was ok. The car has the factory alarm system. And aftermarket Lojac and impact sensor installed. How much power do these draw? Anyone have problems with the battery drain problem? Yes, I have a trickle charger. But battery dead in 5 days!? I tried to replace the battery today with an Optima gel battery. I see there's no application in their charts for the Vette. I'm assuming because of the hydrogen vent on the battery. Does the Optima vent like a standard lead/acid battery? What's everyone else doing about this battery problem? Ed > My battery in my 2008 Z will not start the car after 5-7 days of the car > sitting idle. [quoted text clipped - 16 lines] > > Ed I find it hard to believe that GM would design a car as expensive as the Corvette and Cadillac where the battery would not have enough charge to start the engine after a week of sitting. If true, you need to buy an emergency battery at an auto parts store with jumper cables and carry it around at all times. I rather doubt Honda or Toyota have those kinds of problems with -- shall we say a Lexus 450 or an Acura -- and certainly not BMW. But then, my experience with Corvette dates back to the late 60s when things were simpler. > My battery in my 2008 Z will not start the car after 5-7 days of the > car sitting idle. [quoted text clipped - 14 lines] > > What's everyone else doing about this battery problem? Your GM service rep is full of sh.t, and the Optima battery is also no good. Go get a good battery and put it in and forget what your service rep is telling you. I would jump right straddle your Lojac installer neck and tell them to start over and do it right this time if in fact there is no abnormal parasitic draw from the GM system in the first place. If you do your research the '05 had a real problem and is the only year that forces you to put the 6 speed in reverse or it will kill your battery in a half hour. Still have the yellow warning tag they hung on the shifter rather than fixing it before they started shipping them. Even that was reprogrammed for the '05 and then not required to that degree after '05. While you're doing that research look up the reports on the Optima batteries reliability, not good from what people tell me, I never got one because of all the bad press it was getting in the C5. Mine has sit for about 2 weeks and with 3 days 8, 14, and 14°s below zero with the rest at or below freezing and it started just fine after I read this. One other thing to watch out for is the light switch just in front of your left knee. You can bump that getting in or out and it will leave your reading lights on and they will kill you battery in a few days. Why they won't or don't power down completely I can't answer but it killed my battery once before I noticed them. By the way my Eldorado and or my Seville never did that either.  SignatureDad 05 C6 Silver/Red 6spd Z51 72 Shark Black/Black/4spd 64 Red/red/white top/4spd >> My battery in my 2008 Z will not start the car after 5-7 days of the car >> sitting idle. [quoted text clipped - 20 lines] > tell them to start over and do it right this time if in fact there is no > abnormal parasitic draw from the GM system in the first place. I thought as much. > If you do your research the '05 had a real problem and is the only year > that forces you to put the 6 speed in reverse or it will kill your battery [quoted text clipped - 17 lines] > > By the way my Eldorado and or my Seville never did that either. > Your GM service rep is full of sh.t, and the Optima battery is also no > good. Go get a good battery and put it in and forget what your service rep > is telling you. Well, I went to Costo and Pep Boys looking for a new battery yesterday. Neither stock it. Does that venting system in the Vette fit all batteries or just the stock Delco? The stock Delco should still be under warranty. I guess I'll go to Chevy and see if it's prorated. What's your take Interstate and Sears batteries? I never had much luck with Die Hards in the past. Thanks, Ed >> Your GM service rep is full of sh.t, and the Optima battery is also >> no good. Go get a good battery and put it in and forget what your [quoted text clipped - 5 lines] > Does that venting system in the Vette fit all batteries or just the > stock Delco? May very well fit the fill ports, they should have some standard to making batteries. Sorry, can't be much help in that case, mine has no captive vent system. > The stock Delco should still be under warranty. I guess I'll go to > Chevy and see if it's prorated. While you're there ask them to check the parasitic draw., should be less than 25Ma. That is the standard for a fully charged 660 CCA battery to drop to 9.0 volts or less in 30 day in normal temperatures. It could be as bad a 250Ma and still start it in a week of inactivity. One amp will kill it in less than a day. NOTE--- this can be intermittent as a module wakes up with a stuck relay in the circuit. If you have Onstar it gets worse, as its' modules wake up and go back to sleep repeatedly. If you do and have Lojac you are duplicating activities that may conflict. > What's your take Interstate and Sears batteries? I never had much > luck with Die Hards in the past. > > Thanks, Ed You mean a Sears Die Hard? ;-)) Interstate is as good as we have available to us as consumers. One last thing, how far are your fobs from the car? > One last thing, how far are your fobs from the car? Inside the house, 50 feet. If I go to the car with the fob in the house, the doors are locked and armed. >> One last thing, how far are your fobs from the car? > > Inside the house, 50 feet. If I go to the car with the fob in the > house, the doors are locked and armed. Should be fine at that distance, mine are about 30' with no problems. It might be an interesting exercise to move them further away when you have it up and running to see if that may be a factor since your system is much more complex than that of my '05. G'lux How did the battery problem work out? ... >One last thing, how far are your fobs from the car? What difference would that make? It is a common misconception that the FOB talks to the car all the time. Not true. The FOB is a passive device that only talks if you push a button on it or it is interrogated by the car. The car only interrogates the FOB when you push a button in the car such as opening a door or the start/stop button. You can lay the FOB on the roof of the car and the electronics will still power down normally and not reawaken. To the OP, yes, you have a bad battery. It should be replaced under warranty. Every time a battery gets deep discharged it takes significant life out of the battery. Let me guess, you bought the car off the dealer's lot where it had sat for several months before you bought it. The dealer let it go dead and then jumped it every time a buyer wanted to look at it. There is not a much faster way to kill a perfectly good battery. So, what the dealer told you is BS except, yes, they have the same problem with most of their cars. Tell them to replace it under warranty and then find a new dealer. >>> Your GM service rep is full of sh.t, and the Optima battery is also no >>> good. Go get a good battery and put it in and forget what your service [quoted text clipped - 31 lines] > You mean a Sears Die Hard? ;-)) Interstate is as good as we have available > to us as consumers. As another example, I replaced the Delco in my C4 with an Interstate. It sits for up to 4 weeks and starts right up. I do have a tender on it for the winter though. AJM '93 40th Anniversary coupe, 6 sp (both tops) >> Your GM service rep is full of sh.t, and the Optima battery is also no >> good. Go get a good battery and put it in and forget what your service rep [quoted text clipped - 13 lines] > > Thanks, Ed Unable to find an alternative and usually in a hurry for a new batt, I've bought two Delcos just to match up with GM venting systems. Haven't been really happy with either battery. And, this is SoCal. where there isn't much stress or demand on a car batt. If anyone knows of a brand that will mate up with GM vents plse post here. Or, is there an aftermarket adapter that vent competitor's batteries? Local NAPA, AutoZone and Kragen were clueless. tks -- pj |
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