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Old 03-13-2015, 09:30 PM
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Power consumption when vehicle is off

Guys I need your help on this one but I may know the answer. I have a 2015 Jeep Grand Cherokee Limited ECO diesel. I have the 8.4 U-connect and other bells and whistles that come with this Vehicle. I also have a 2010 Dodge Challenger RT Classic without the U-connect. The question I have is, will the Jeep Cherokee run down the battery quicker than the Challenger if it just sits idle in the garage? I bring this up because I use a battery tender on the Challenger and the Jeep and made sure they were at full charge. I then disconnected the battery tenders and went on a 9 day trip. If anyone of you have used these great battery tenders you know what I will be saying next. When I got home, I re-hooked up the tenders. Like normal they went to the high charge rate. But within an hour the Challenger had the blinking green light meaning it was at 85% charge and heading to maintenance mode. After 4 hours the Jeep is still at the high charge rate. When the Jeep is off in the garage, I assume there are lots of on-board computers that require stand by power from the Jeep battery, hence the draw down. I assume the Challenger does not have as high of stand by mode? Anybody know what the parasitic draw is of the Jeep when it's sitting in the garage? Mike

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  #2  
Old 03-14-2015, 08:24 AM
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Re: Power consumption when vehicle is off

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Originally Posted by mbaessler View Post
Guys I need your help on this one but I may know the answer. I have a 2015 Jeep Grand Cherokee Limited ECO diesel. I have the 8.4 U-connect and other bells and whistles that come with this Vehicle. I also have a 2010 Dodge Challenger RT Classic without the U-connect. The question I have is, will the Jeep Cherokee run down the battery quicker than the Challenger if it just sits idle in the garage? I bring this up because I use a battery tender on the Challenger and the Jeep and made sure they were at full charge. I then disconnected the battery tenders and went on a 9 day trip. If anyone of you have used these great battery tenders you know what I will be saying next. When I got home, I re-hooked up the tenders. Like normal they went to the high charge rate. But within an hour the Challenger had the blinking green light meaning it was at 85% charge and heading to maintenance mode. After 4 hours the Jeep is still at the high charge rate. When the Jeep is off in the garage, I assume there are lots of on-board computers that require stand by power from the Jeep battery, hence the draw down. I assume the Challenger does not have as high of stand by mode? Anybody know what the parasitic draw is of the Jeep when it's sitting in the garage? Mike
mbaessler, I have the same issue with my '02 Jeep Overland. I got tired of having a dead battery everytime we went away for long holidays. So, I installed an Optima red top (deep cycle) battery & have not had any problems since. It will go for 5-6 weeks now & still crank over (albeit very slowly!). I also have one of these for jump starting my own battery. Best invention ever . . .

http://www.amazon.com/Antigravity-Ba...ds=micro+start
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  #3  
Old 03-14-2015, 08:49 AM
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Re: Power consumption when vehicle is off

I started using Optimas many years ago and have thought about replacing my Mopar battery with one but I didn't think it would fit. Which model did you use?

Dan
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Old 03-14-2015, 06:13 PM
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Re: Power consumption when vehicle is off

I had so-so experiences with Optimas on my Gen-I Durango, but YMMV.

The '14 FSM says the long-term ignition-off draw should be <= 0.04A .. using very rough figures, a 1A tender should take 1-2 hours for every day the vehicle sat.. double that for a half-amp tender..

...tom
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Old 03-14-2015, 10:17 PM
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Re: Power consumption when vehicle is off

I drive OTR so my ECOdiesel sits 2-4 weeks at a time. Has always started on 1st crank. Hope I didn't just jinx myself.
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Old 03-15-2015, 05:26 PM
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Re: Power consumption when vehicle is off

You can always pull the IOD fuse.. You may lose some presets if you do, but the vehicle should be fine sitting for months with the fuse out..
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Old 03-16-2015, 01:42 AM
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Re: Power consumption when vehicle is off

I have a jump start battery pack that I throw in the Jeep during the winter and when I am leaving it at the airport for a week or more, just in case.

From the manual:

If you are leaving your vehicle dormant for more than 21 days you may want to take steps to protect your battery.

You may:
• Disconnect the negative cable from the battery.
• Anytime you store your vehicle, or keep it out of service (i.e. vacation) for two weeks or more, run the air conditioning system at idle for about five minutes in the fresh air and high blower setting. This will ensure adequate system lubrication to minimize the possibility of compressor damage when the system is started again.
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Old 03-16-2015, 02:19 AM
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Re: Power consumption when vehicle is off

I'm of the understanding that if a Red Top is being discharged by parasitic loads to the point of slow crank, you're kinda killing it. They are engineered for high cranking amps, not deep discharge. They use good quality materials, so will handle it to a degree... at the expense of their service life.

With regards to tenders, make sure that they are definitely AGM battery compatible. Incorrect charging can be worse than no charging.

It's not hard to move the seat forward, pop the cover and lift the negative terminal.

Cheers,
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Old 03-16-2015, 04:09 AM
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Re: Power consumption when vehicle is off

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Originally Posted by tomk View Post
You can always pull the IOD fuse.. You may lose some presets if you do, but the vehicle should be fine sitting for months with the fuse out..
Hm, just did a little digging around and apparently there is no longer an IOD fuse.. I guess too many things need keepalive power these days..
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Old 03-16-2015, 09:35 AM
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Re: Power consumption when vehicle is off

Steve I believe in taking the negative cable off on older vehicles, but with these new vehicles won't you lose all your settings? Maybe that's why using a tender may be the best option? I just get paranoid leaving the tender plugged in while I'm gone.
Mike
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Old 03-16-2015, 09:39 AM
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Re: Power consumption when vehicle is off

All valid considerations mate. You gotta choose your poison. ;-)
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Old 03-17-2015, 09:43 AM
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Re: Power consumption when vehicle is off

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Originally Posted by Barboots View Post
All valid considerations mate. You gotta choose your poison. ;-)
I keep one of these on my Honda GL1800 motorcycle year round & also have one on my Nissan Xterra when overseas. They have worked well for years!

Battery Tender® Plus
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