Battery
Thread Starter
Le Mans Master
Joined: Dec 2015
Posts: 8,711
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From: here
Battery
With all the electronics on the C7 if it was parked in garage a week without trickle charger, any concearn of start up? thanks , just wondering no outlet near my present garage slot...Im guessing no problem but certainly not sure one way or other..
Racer
Joined: Feb 2015
Posts: 282
Likes: 69
From: Granbury Texas
Team Owner
Joined: Apr 2013
Posts: 26,259
Likes: 4,363
From: Chirper Island
I started mine on Friday after a week of sitting because it was too cold to use it. Started up just fine with no hesitation.
I was not at all certain that it would start, because the battery is four years old and has never been on a tender.
I started it several times since then, and, so far so good.
I was not at all certain that it would start, because the battery is four years old and has never been on a tender.
I started it several times since then, and, so far so good.
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Pouria Savadkouei
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,076
Likes: 12,433
From: NE South Carolina
Good posts with the answer-it should hold 30 days. That is what it says in the Service Manual if it starts at 80% charge.
The reason is your premise is not correct! The C7 shuts down everything (pretty much) after 5 to 10 minutes. Leave a map light on, (like I did on my '88 and had a dead battery in the morning) and the car shuts it off in ~5 minutes. Same with most "electronics." OnStar, for example turns itself on for a very short time periodically then shuts itself off.
Leave the hatch open with the rear hatch interior lights on-they shut off in ~5 minutes!
It's not like prior Vettes! All those "electronics" are also smart and manage themselves even when you don't!
The reason is your premise is not correct! The C7 shuts down everything (pretty much) after 5 to 10 minutes. Leave a map light on, (like I did on my '88 and had a dead battery in the morning) and the car shuts it off in ~5 minutes. Same with most "electronics." OnStar, for example turns itself on for a very short time periodically then shuts itself off.
Leave the hatch open with the rear hatch interior lights on-they shut off in ~5 minutes!
It's not like prior Vettes! All those "electronics" are also smart and manage themselves even when you don't!
Last edited by JerryU; Jan 14, 2018 at 12:23 AM.
Le Mans Master
Joined: Aug 2000
Posts: 6,486
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From: Las Vegas NV
Last edited by Kent1999; Jan 14, 2018 at 12:40 AM.
Le Mans Master
Joined: Jun 2002
Posts: 6,433
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From: Commerce Texas
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,076
Likes: 12,433
From: NE South Carolina
Not true. The C7 *always* has a very slight draw to power the alarm, the keyless entry system (something's got to be powered up and listening for the ping when you press a fob button), etc etc. C7 does a pretty good job putting everything into a very low power mode when you shut down and walk away, but it's never a "no power draw" situation.
But to put in perspective, the Service Manual says the current draw will be under 40 milliamps. That would be like a ~4 watt bulb in your house! Some items are only activated periodically.
Last edited by JerryU; Jan 14, 2018 at 07:05 AM.
E-Ray, 3LZ, ZER, LIFT
Joined: Sep 2007
Posts: 35,076
Likes: 12,433
From: NE South Carolina
^^^
Very efficient. I wired my Street Rod from scratch. It has few microprocessors! The dash is digital but with the ignition switch off, only enough power is used to maintain the odometer reading. Have remote doors/windows and an alarm. I have remotes for the rear mounted radio and CD changer but those units are only powered when the ignition is on. It also has a solid state ignition/rev limiter but it also only is energized with the ignition.
It was drawing ~80 milliamps so I put a switch on the alarm circuit to reduce the current draw when it's parked in the garage. Not much help!
The battery was draining excessively and I finally made some calculations and found a ~20 mile drive every ~2 weeks was not charging the battery sufficiently to compensate for the steady current draw and the current drain when the 8.2 Liter engine was started! The car has been on a maintenance battery charger since!
Very efficient. I wired my Street Rod from scratch. It has few microprocessors! The dash is digital but with the ignition switch off, only enough power is used to maintain the odometer reading. Have remote doors/windows and an alarm. I have remotes for the rear mounted radio and CD changer but those units are only powered when the ignition is on. It also has a solid state ignition/rev limiter but it also only is energized with the ignition. It was drawing ~80 milliamps so I put a switch on the alarm circuit to reduce the current draw when it's parked in the garage. Not much help!
The battery was draining excessively and I finally made some calculations and found a ~20 mile drive every ~2 weeks was not charging the battery sufficiently to compensate for the steady current draw and the current drain when the 8.2 Liter engine was started! The car has been on a maintenance battery charger since!
Last edited by JerryU; Jan 14, 2018 at 08:53 AM.
Drifting
Joined: Oct 2005
Posts: 1,355
Likes: 718
From: Terrell North Carolina
At that 40 milliamps, that is pretty good, considering in states like NC where we have a yearly inspection, the computer has to have a keep alive memory so the drive information will let the car pass inspection because if it shut completely off, we would have to drive about 100 miles to get all the emission monitors to pass.
Moderator
Joined: Feb 2006
Posts: 39,196
Likes: 18,050
From: DFW Area TX
We may be "outliers" because we drive them regularly - thereby keeping the battery in good condition without needing a trickle charger.
Team Owner
Joined: Apr 2013
Posts: 26,259
Likes: 4,363
From: Chirper Island
My mirrors are now misbehaving, nothing else, but hey, after as many miles on C6s as I have, this is the writing on the wall.
I have always let the boys at the autopartstore replace them, and am an inclined to do so here, is there any reason not to let them do so?
Le Mans Master
Joined: Sep 2003
Posts: 8,847
Likes: 795
From: Longview Texas
I had to say something, didn't I?
My mirrors are now misbehaving, nothing else, but hey, after as many miles on C6s as I have, this is the writing on the wall.
I have always let the boys at the autopartstore replace them, and am an inclined to do so here, is there any reason not to let them do so?
My mirrors are now misbehaving, nothing else, but hey, after as many miles on C6s as I have, this is the writing on the wall.
I have always let the boys at the autopartstore replace them, and am an inclined to do so here, is there any reason not to let them do so?
