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#4783587 - 06/11/18 06:57 AM Back seat battery
Duffyjr Offline

Registered: 01/13/16
Posts: 563
Loc: Nebraska
Are batteries lasting longer when they're located outside the engine bay away from the heat?
89 GMC Sierra T5 10w30/Wix
08 Lucerne CX NAPA Blend 5w30/Napa Gold
18 Toro Super Recycler T5 10w30

#4783595 - 06/11/18 07:16 AM Re: Back seat battery [Re: Duffyjr]
Char Baby Offline

Registered: 05/25/05
Posts: 10202
Well, I am going to say, NO! When they're in the engine compartment, they are right in the way of cooling air coming into the engine bay. As were the batteries that are located in the trunk or backseat area, or even the wheel well of the car(Chrysler), don't seem to show any benefits for longevity. I think the battery placement is for weight balance.

Batteries that are in vehicles living in the HEAT BELT suffer from more earlier failures regardless of their location in the vehicle. Batteries not maintained also fail early regardless of the location in the vehicle.

This is just my opinion.


'06 Mazda 3i 2.0L-FOR SALE NOW!
'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX(17K)

#4783696 - 06/11/18 09:50 AM Re: Back seat battery [Re: Duffyjr]
Lolvoguy Offline

Registered: 02/06/14
Posts: 2461
Loc: Canada
I'm gonna go with "yes".
As the temps are more stable and generally cooler when away from the heat of the engine bay.
06 Lexus IS350- Wife
88 BMW 325is- Mistress

#4783707 - 06/11/18 10:01 AM Re: Back seat battery [Re: Duffyjr]
Ryan Offline

Registered: 12/04/02
Posts: 387
Loc: Stallings, NC
Iíd say the battery being out of the engine bay would be better for it, but Iím sure the engineers donít care about the longevity of your battery. They are probably doing it because of less room under the hood.

#4783781 - 06/11/18 11:08 AM Re: Back seat battery [Re: Char Baby]
SeaJay Offline

Registered: 03/05/15
Posts: 1135
Loc: New York City
Originally Posted By: Char Baby
Batteries not maintained also fail early regardless of the location in the vehicle.

This is just my opinion.


I thought batteries in today's cars were maintenance free? If not, I better start doing some maintaining, after I figure out what needs to be done.

#4783791 - 06/11/18 11:20 AM Re: Back seat battery [Re: Duffyjr]
Kestas Online   content

Registered: 06/04/02
Posts: 12468
Loc: The Motor City
I agree with Ryan, heat is not the primary reason the battery is moved from the engine bay. Wherever the battery sits, corrosive vapors is a concern. Plus, the longer cables will reduce the power available for starting, unless the cables are thicker.

#4783795 - 06/11/18 11:22 AM Re: Back seat battery [Re: Duffyjr]
redbone3 Offline

Registered: 06/09/12
Posts: 671
Loc: Reno, NV
I have owned cars with batteries in all locations. Cooler is better.
2014 Passat Wolfsburg, 1995 Miata.

#4783924 - 06/11/18 01:01 PM Re: Back seat battery [Re: Duffyjr]
Rand Offline

Registered: 08/20/03
Posts: 12831
Loc: NE,Ohio
Can definitely help. Its somewhat known that batteries in the 2014+ cherokee live short lives.. due to excessive heat.
Many going before the 3 year mark... even in the years previous to having auto start/stop.
2019 Jeep Cherokee Trailhawk 2.0T

#4783947 - 06/11/18 01:47 PM Re: Back seat battery [Re: Duffyjr]
maxdustington Offline

Registered: 01/21/17
Posts: 1055
Loc: Toronna
Depends on the location. In Canada it might help stabilize the temp for cold starts if the battery is located inside, and less exposure of connections to a corrosive atmosphere. The resistance from the wiring might negate these advantages.

Have you ever seen industrial vehicles where the battery is just hanging off the side of the frame? I do not think it matters one way or the other.
03 Jetta AWP/09A 200k kms
Edge 0W40 + Mann 719/30

#4783986 - 06/11/18 02:59 PM Re: Back seat battery [Re: Duffyjr]
mjoekingz28 Offline

Registered: 11/21/07
Posts: 3996
Loc: United States of America
A battery mat to absorb shock, keeping the case clean, the water level proper if it has caps, and of course the terminals clean and corrosion free (and a light film of oil or grease if that's your thing) is all I think is needed in a regular car. Of course regular charging if it is rarely driven or a detached negative cable are good.

A Cobalt I had placed the battery in the spare tire tub/well low in the trunk. It has a vent hose for (hydrogen?) fumes- but dont AGMs solve that issue? I think that is a perfect location for a sporty car for the weight issues. Also, the battery is out of the way for more room in the engine bay and also, smokers and those careless can be safer not having it under the hood when doing work to the car.

As for do they last longer....I would guess they would with all things being equal. But if you treat your underhood battery like royalty then they would probably last equal in time. Its just with the battery inside it probably require alot less attention and that is good for the sealed non-greasable steering and suspension components.

#4788564 - 06/16/18 08:01 PM Re: Back seat battery [Re: Duffyjr]
ENGINEER60 Offline

Registered: 03/13/10
Posts: 92
Loc: West Virginia
YES they are.
Chevy cobalts can easily go 8 years or more on a battery because it is mounted in the trunk out of the temp extremes, vibration, and eposure to liquids dirt, and corrosives.

Edited by ENGINEER60 (06/16/18 08:02 PM)

#4788605 - 06/16/18 08:53 PM Re: Back seat battery [Re: Duffyjr]
eljefino Online   content

Registered: 06/15/03
Posts: 32911
Loc: ME
MIL's lesabre got 12+ years from the stock battery under the rear seat and wife's HHR was sold at year 10 (11?) with its OE trunk battery.

#4790714 - 06/19/18 07:05 AM Re: Back seat battery [Re: Duffyjr]
HYUNDAIFAN0001 Offline

Registered: 05/11/18
Posts: 317
Loc: GA
Originally Posted By: Duffyjr
Are batteries lasting longer when they're located outside the engine bay away from the heat?

If having 3 batteries (includes the original) in 18 years for my 2000 E320 Mercedes is any indication...the answer is yes...having a battery away from outside elements helps longevity.
Always taking care of my rides.