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Well that's pretty typical and its about what I was expecting. Assuming that's true (probably is) then in theory, these cars should sit around for three, four and five months at a time. Something more must be happening that no one has picked up on or something.
Originally Posted by DAVE396LT1
I bet the wireless connection stuff can be a bigger draw. I know when I was logging ESP32 current demand, when the WiFi connects there is a HUGE spike that browned out a lot of desktop power supplies. I don't mean the car would have any issue with that huge battery, but radio comm is like heat... just expensive in terms of power.
Long story short, I think my takeaway is "try Transport mode to see if does much", and "If it's more than 2 weeks, put the tender on". Thanks all!
Originally Posted by Zjoe6
40ma times 24 hours is 960 mah. Close enough to 1000 which is 1 ah per day. That’s 30 ah per month.
Back at my computer with a "stash of pics!" This is what it says in the Service Manual. Most batteries will self discharge, especially the cheaper OEM's! I'm sure that is part of what this reflects. I did recall the 80% and 50% correctly!
Some folks have quoted longer than 30 days. I would make that a limit myself.
Back at my computer with a "stash of pics!" This is what it says in the Service Manual. Most batteries will self discharge, especially the cheaper OEM's! I'm sure that is part of what this reflects. I did recall the 80% and 50% correctly!
Some folks have quoted longer than 30 days. I would make that a limit myself.
Ok so that helps.
The reserve capacity of these batteries must not be very much.
OnStar "waking up" occasionally is what I needed to know.
Last edited by PatternDayTrader; 12-10-2018 at 11:53 AM.
Mine won't. Just curious what others experience when not driving theirs. Only accessory I have is a V1 which is off when the car is off.
In the olden' days you could use "less" power when dormant buy putting the stick cars in reverse, or so some people claimed, don't know if its true. But if there's any way to reduce demand when parked, please let me know!
it’s a close call even in relatively new battery like my ‘17 with only 2800 mi. I don’t leave the tender on as it has terminal clamps like a jump charger, only need to top off for a few hours, just feel that is healthier for the battery life, though no proof.
^^^
FWIW, you can leave most quality low amp chargers on that shut themselves off, like the Chevy charger or what many of us buy the same one for >1/3 less from Amazon etc!
I hardly ever use my Chevy charger equivalent even when going on vacation for 2 1/2 weeks. However I leave the less expensive Schumacher charger on my Street Rod 365 except for when it's going to a Show. That Optima Yellow Top is sealed. I just replaced it NOT because it was needed but it was almost 10 years old! Keeping a charger on definitely prolongs life. Would have waited for a sign of failure BUT it has electric doors and windows and the battery is inside the car! PIA if at a Show and can't open the doors or windows.
Keep the fob as far away as possible. My car goes two months with no charge no problem
Mine are wrapped in aluminum foil. Got that tip from a security expert. Then there's no way for the losers to intercept them transmitting back to the car.
Hook up my 10 year old Deltran trickle charger whenever the 45 month old car car is going to sit a week or more. I especially like the fact I can use the connections under the hood vs. under the hatch. No problems whatsoever, just like there were none under the same circumstances with my BMW or Lexus.
I find that hard to believe, although it could be true.
The last Corvette to have a fob that actively talks to the car and vice-versa was in 1999.
Since then, They never talk or ping each other unless a button on either the car or fob is pushed. (not talking about exiting--that's a little bit of pinging for a very short amount of time).
They both spend a small amount of energy "listening" for commands from the other, but they have no way of knowing if the fob is taped to the windshield or if it's half-way across the globe, so since they both are passive (unless a button is pushed), it makes no difference to battery life.
The last Corvette to have a fob that actively talks to the car and vice-versa was in 1999.
Since then, They never talk or ping each other unless a button on either the car or fob is pushed. (not talking about exiting--that's a little bit of pinging for a very short amount of time).
They both spend a small amount of energy "listening" for commands from the other, but they have no way of knowing if the fob is taped to the windshield or if it's half-way across the globe, so since they both are passive (unless a button is pushed), it makes no difference to battery life.
I would have to see the literature on that before I would bet on it. Until then, ill take you on your word.
I will be going to Germany shortly for five weeks. After reading this post I will use my Battery Tender to support the C7's battery while gone. One problem through. The Battery Tender has alligator clips on the end and I want to install a lighter plug on it. It appears the center pin on the lighter plug is the positive and the side terminal is the ground. Is this correct?
I'll read this thoroughly tomorrow, but at first glance its dated 2005 so I dont like that already. Plus under the prognostication header (preasumably meaning the direction things are heading) in the article, it admits that two way communication occurs between the fob and receiver once the receiver is in range. This can only mean additional parasitic draw due to the reciever being awake.
I think this article is describing a generic remote keyless entry system which isn't really applicable. I'll read every word tomorrow to be sure.
Last edited by PatternDayTrader; 12-11-2018 at 12:03 AM.
Yes, the receiver is awake (not always, but frequently) listening for the fob to transmit. owc6 mentions that: . 2005 is not all that old considering automotive design times. The electronics designs in the C7 are at least 7 years old (probably even older).
I agree that 05 should still be applicable, but if the article is correct then the draw will be higher when the fob is in range of the receiver because instead of just listening for the transmitter, the receiver wakes up in preparation for the next command. Now it seems to me Chevrolet has probably resolved the parasitic draw as it relates to this issue between 05 and present.
I'm not disputing what owc6 is saying. Theres a pretty good chance shes righ, because if she is wrong, then that would mean you could kill the battery solely by leaving the fob within range of the car, and i dont think that's the case.
Still, I want to see the data so I understand the system. Otherwise I'll be wrapping a fob in foil or some other crazy thing before I do a draw test on one of these cars.
Last edited by PatternDayTrader; 12-11-2018 at 12:43 AM.
Yes, the receiver is awake (not always, but frequently) listening for the fob to transmit. owc6 mentions that: . 2005 is not all that old considering automotive design times. The electronics designs in the C7 are at least 7 years old (probably even older).
That coupled with the fact that the RKE design in both the C6 (starting in 2005) and the C7 work in virtually the same way. There are a few deviations such as freq difference, and number of and location of antennas in the car itself, but otherwise, the systems both operate basically the same.
12-10-2018, 11:43 AM
