Battery Warmer? - JeepForum.com

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post #1 of 25 Old 11-20-2013, 05:49 PM Thread Starter
TerrestrialAlms
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Battery Warmer?

Hello,

I recently moved to Winnipeg, where I anticipate I (and my '14 Grand Cherokee) will experience the coldest winter temperatures I've ever encountered. I do have an engine block heater installed, but would it be advisable to purchase a battery warmer/blanket as well? I anticipate having to work night shifts, which means plenty of nights where my vehicle will be parked outside and exposed to the elements. From what I understand, the battery in the newer Grand Cherokees is under one of the seats in the passenger compartment. I imagine that might help protect the battery some from the cold, but if the vehicle is going to be outside for an extended period, I"m not sure that would be enough. Thanks!

T.A.

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post #2 of 25 Old 11-21-2013, 03:34 PM
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I don’t think they make one for the WK2 but personally I think you will be just fine without it as mentioned, it's under the seat too...Block warmer helps the most with keeping the fluids warm which will make it easier to start. Just my opinion though. My CTD has started with no issues at -10 when we go ice fishing up at the lakes...

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post #3 of 25 Old 11-24-2013, 09:16 AM
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I don't see how a blanket around a battery will keep it warm. There is no source of heat.
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post #4 of 25 Old 11-24-2013, 09:22 AM
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Quote:
Originally Posted by TerrestrialAlms View Post
Hello,

I recently moved to Winnipeg, where I anticipate I (and my '14 Grand Cherokee) will experience the coldest winter temperatures I've ever encountered. I do have an engine block heater installed, but would it be advisable to purchase a battery warmer/blanket as well? I anticipate having to work night shifts, which means plenty of nights where my vehicle will be parked outside and exposed to the elements. From what I understand, the battery in the newer Grand Cherokees is under one of the seats in the passenger compartment. I imagine that might help protect the battery some from the cold, but if the vehicle is going to be outside for an extended period, I"m not sure that would be enough. Thanks!

T.A.
The battery is under the pass seat.
Block heater works well on my v6. Takes about 2 hrs to make a noticeable difference. Jeep says to use the block heater anytime the outside temp is under 20 deg f.
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post #5 of 25 Old 11-24-2013, 09:25 AM
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The simple blankets just retain heat, there are ones with electric elements you plug in (like an electric blanket).

I'm not sure how easy the current diesel is to start, there doesn't seem to be much complaint from overseas where they've been used for years. Use the block heater below 30 degrees F to take a load off the starter motor, and to give you heat much earlier. Should be good down to -20F . Not the same motor, probably harder to get spinning, but my cummins never had an issue starting even without the block heater. The block heater saves wear and tear.... come to think of it, the truck also had two batteries

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post #6 of 25 Old 09-19-2014, 08:36 PM
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Just my opinion though. My CTD has started with no issues at -10 when we go ice fishing up at the lakes...
lol, -10


below -40 **** starts to happen with batteries... last winter it got close to -50 here and my battery just shattered.

I need to install my battery blanket.... I just wonder how I will pass the plug through, drill the body and silicon around it?
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post #7 of 25 Old 09-19-2014, 09:44 PM
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Dunno, but the new WK2 battery is an AGM type which uses solid electrolyte and is much more resistant to freezing. The battery compartment does include a thermal blanket. I've read that AGM batteries use a solid compound and therefore freezing temperatures have no bad (damaging) effects on the battery. It would have reduced capacity, however.

Read more : http://www.ehow.com/info_8398809_dif...batteries.html

http://www.wk2jeeps.com/wk2_battery.htm

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post #8 of 25 Old 09-20-2014, 01:11 AM
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" AGM" batteries experience...

My wife has had AGM batteries in her two Miata's since 1990 . They were made by Panasonic in Japan. They have been extremely reliable and long lasting in a mix of climates . Typical life was eight years . They are pricy at $120 for a small battery. The one thing that kills a AGM battery is to allow it to fully discharge. They do not respond well to a battery charger and may not take a charge .
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post #9 of 25 Old 09-20-2014, 08:11 AM
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The issue is that at -40 or below, the battery only gives a low % of its cranking power, and even with a plugged block heater all night, the cars usually do not start.
You need the battery at 100% (heated), plus the block heater to start the car on a morning below -40... So I need to install my heated blanket asap :P But it keeps raining all the time here.
I need to see if I can use the vent hole, or if I need to drill a hole for the 120v plug, then paint around the edges, and then silicon around the plug, but I don't really like drilling through my paint and car metal....
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post #10 of 25 Old 09-20-2014, 09:09 AM
ColdCase
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Originally Posted by kryogen View Post
The issue is that at -40 or below, the battery only gives a low % of its cranking power, and even with a plugged block heater all night, the cars usually do not start.
Sorry, we thought you said you were concerned about the battery exploding at low temps.

Current: 2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6
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post #11 of 25 Old 09-20-2014, 07:21 PM
kryogen
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Sorry, we thought you said you were concerned about the battery exploding at low temps.
what happens is that it's -40, you only have 20% cranking power left, then you crank the car a few times, doesnt start, then the battery gets to 70% charge, or whatever, and it's -40, so in the next 15 minutes, your battery freezes and cracks. Of course, the AGM might not crack, but it would probably still be ruined.

Other issue is that, at 100% charge, it will not freeze. But your car has a crap load of electronic gadgets, and it doesnt stay at 100% for long.

Let's say you have a cold week that is close to -40 all week.
If you drive short trips, and never warm it, or charge, you will eventually ruin the battery.

Start the car cold, battery doesnt charge so well, stop the car, start, even less power, doesnt charge so well, stop again, -40 night, dead battery....

A battery warmer ensures that your battery starts the car with 100% power, that it doesnt freeze, and that it's able to charge ASAP after starting the car.

On morning that are -40 or colder, most cars just dont start on my street. It's so cold that the exhaust fumes dont even raise, they stay on the ground. same with chimney fumes. They get out, then fall down on the house. weird. When you see that, it's too cold :P

Why didnt they just put the damn battery under the hood?
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post #12 of 25 Old 09-20-2014, 09:00 PM
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Yeah understand that, spent some time in some of those northern bases. Most around here, that have to get out in the morning, either have a garage or leave the vehicle running. There is probably no room under the hood for the battery and they want to protect the battery from damage caused by high engine compartment heat. A few of my cars had the battery in the rear. I guess they sell more Jeeps to those in hot climates than those in cold

AGMs won't freeze because they are already solid, no liquid. But, as with all car batteries, they don't like the cold and lose starting capacity. Your local dealer may have a kit, I know they offer them for the Wrangler..

Like this one that I think is made in Canada:

http://www.ebay.com/itm/NEW-2014-JEE...-/330375776816

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post #13 of 25 Old 09-21-2014, 07:16 AM
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yeah I have one already, but how do you pass the plug through to the front grille?
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post #14 of 25 Old 09-21-2014, 09:51 AM
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Quote:
Originally Posted by kryogen View Post
The issue is that at -40 or below, the battery only gives a low % of its cranking power, and even with a plugged block heater all night, the cars usually do not start.
You need the battery at 100% (heated), plus the block heater to start the car on a morning below -40... So I need to install my heated blanket asap :P ...
I grew up where it would get -35 degrees for days or weeks on end and never had a battery warmer or a block heater and not once had a vehicle fail to start.Also talking about carb'd engines also with regular wet celled batteries.My Cutlass had a Holley Dominator 1050cfm carb on it and no choke and started just fine at -35 degrees with a 700cca rated wet celled battery.

In both my Jeep and Town Car I use Odyssey batteries that are majorly over rated for the vehicle and never have any issues.My Jeep requires a group 25 battery(500cca rated) and have a group 34/78 PC1500DT in it that still tests to over 1000cca's when the battery is at -5 degrees.

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post #15 of 25 Old 09-21-2014, 04:59 PM
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yeah I have one already, but how do you pass the plug through to the front grille?
Couldn't you just pass it out the rear passenger door? No reason for it to have to go out thru the engine compartment, your just going to plug it into an extension cord.

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