Guess Again? The Worst and Best spot in a car to keep a light.

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jeff51
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Guess Again? The Worst and Best spot in a car to keep a light.

The safety of keeping Lithium batteries in automobiles has been discussed in several threads here on the BLF.
Safe temperatures have been quoted for various cell makers.

– New Data Run at the Bottom –

I thought it might be fun to see just how hot the most likely storage spots might get during a hot day in Texas.

The official temperature hit 113F.
My car thermometer hit 115F on the way home – with a cloud blocking the sun part of the time.

I setup a data logger with 3 probes and set it to take a temperature reading every 5 minutes.
Make a guess which one is:

Under the Driver’s Seat
The dashboard Glovebox
The center Console

The test subject is a dark gray 4 door Toyota with a black interior.
I got the logger going in the house and then I ran some errands.

I parked the car in full sun on the east side of my office building at 11:32am.
I had all the windows up and didn’t open the car till I went home at about 5:25pm.
Using an infrared thermometer I pulled the following temps.

Time – - – - – Dash ___ Asphalt, __ Roof
11:32am __ 118, ____ 141, _____ NA
12:43am __ 135, ____ 167, _____ 165
01:45pm __ 156, ____ 170, _____ 185
02:45pm __ 156, ____ 157, _____ 192
03:45pm __ 148, ____ 156, _____ 181
04:45pm __ 117, ____ 115/156, __ 112

At 4:45 the car was in the shade of the building.
The two asphalt temps are taken in shade and in sun.

I was kind of stunned to see how hot the roof got.
You can’t fry an egg, but you can sure as heck cook one on the roof or the pavement.
I would bet batteries in remotes would last longer if not kept in a roof compartment.
For those who are Celsius thinkers:
126.3F = 52.4C
146.6F = 63.7C
138.5F = 59.2C
170F = 76.7C
192F = 88.9C

You can see how quickly the car cools off when I head home with the AC running full blast.

I’ll post the answer in a few days after a few guesses have been made.
All the Best,
Jeff
===============================
RESULTS – Coolest place in the car post #27

===============================

Guess Again

Below is another temp log. This time looking at the worst places to store a light in a car.
The test subject is the same as the above.
It’s parked in the same spot in the parking lot.
The high for the day was 96F. That’s 17F less than the first run.

Guess which is:
Front Seat Area – cabin temp if you will
Center Console
Roof Console
Trunk

And I’m withholding any temps taken while the car was running.
That should make the guessing game a bit tougher.
Later I’ll post a version that shows more data.
And yes, jon probably got this one right also…
All the Best,
Jeff

Edited by: jeff51 on 09/07/2019 - 17:18
Oli
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Heat rises. There are other variables in a car such as whether or not sunlight can get at various places and other heat sources such as engine, exhaust, so forth. So the best is going to be under the drivers seat in most cars.the glove box may be influenced by engine heat and or the heater core and or direct sunlight. So the center console is probably the second best choice. Edit I try not to park where the sun will be coming in the windshield if I can help it in the summer. In the winter it’s just the opposite.

mopar440_6
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Center console is my bet. Would liked to have seen a control reading based on cabin air temperature. But still good data.

CalvinIS
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My guess:

Blue: Below Driver's Seat
Yellow: Center Console
Red: Glove Box

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Scallywag
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Oli wrote:
Heat rises. There are other variables in a car such as whether or not sunlight can get at various places and other heat sources such as engine, exhaust, so forth. So the best is going to be under the drivers seat in most cars.the glove box may be influenced by engine heat and or the heater core and or direct sunlight. So the center console is probably the second best choice. Edit I try not to park where the sun will be coming in the windshield if I can help it in the summer. In the winter it’s just the opposite.

I also think, from coolest to hottest:
  1. Under the driver’s seat
  2. Center console
  3. Glovebox

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4492011
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Center console Blue
under driver seat red
glovebox yellow

Helios azimuth
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Center console Blue
Under driver seat yellow
Glovebox red

Stittville Ed
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CalvinIS wrote:

My guess:


Blue: Below Driver’s Seat
Yellow: Center Console
Red: Glove Box

I will go with Calvin on this one.

brad
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Under seat coolest, glove box 2nd coolest, middle console worst.

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brad wrote:
Under seat coolest, glove box 2nd coolest, middle console worst.

I second that one. The hottest items are exposed to the sun.

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ValuseekeR
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4492011 wrote:
Center console Blue under driver seat red glovebox yellow

This is my guess too. Speculating that the closed compartments benefit from not being directly exposed to the hot cabin air, while under the seat would be.

Mr.Poppy
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Let me go all wrong here Silly

Blue=Glove Box
Red=Seat
Yellow=Console

or

like @4492011 said

Blue=Console
Red=Seat
Yellow=Glove Box

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jon_slider
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does it matter?
they are all too hot to charge the battery (all are over 113F), so dont leave a liIon on charge in the vehicle, on a hot day

the hottest spot is also above the max operating temp for a LiIon (140F), so dont try to use that light until it cools doewn, or it may have “venting with fire”

otoh, if you neither charge, nor use the lights, at the temperatures stored in a car
then

it makes no difference where in the car the light is..

I hate guessing, so, when youre ready, just tell me Im right.. cause I already know where the hottest spot is, and I aint tellin.. lol

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I’m going to say under the seat is the hottest due to the heat coming off the asphalt. My initial thought was that the glovebox would be the hottest place since the sun would be beating down on the dash but I’ve never noticed my glovebox being hot when I reach in it.

neo71665
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1. Glove box the coolest
2. Under the seat
3. Center console the hottest

Of course the coolest spot in my Blazer is in the rear in the ice chest. Also another major variable is if your windows are tinted and how dark they are. Even with my fishbowl the rear being tinted 20% you can tell it’s cooler than the front seats with 35% on the doors. I use a windshield shade if I have to park long term in the sun. My interior is saddle (tan) so it will be cooler than a grey or black most modern cars come with.

TheIntruder
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Anybody who’s ever worked on a sunroof is familiar with how hot the roof of a vehicle can get. A few square feet of sheet metal acts as a nice collector and heat sink in direct sunlight.

It’s tough on thin layer of foam between the headliner fabric and the backing board, and the adhesives that hold the sandwich together. Drooping headliners are not uncommon, even though they’re serve no duty other than as decoration, and receive no direct contact or wear. Refinishing them requires an adhesive that is both strong and heat resistant.

Modern vehicle designs with steeply raked windshields result in more dashboard surface area, and more exposure to sunlight, and a dark-colored dash, as they often are, adds to that. So the glovebox, sitting below that nice heat collector, is my guess as the hottest of the candidates.

Between the center console, and under the driver’s seat, the latter sees the least exposure, and is unenclosed, so it will be the cooler of the two. The floor contains most of the sound insulation material in a car, and between it and the carpeting, is well insulated from ground heat, as well as that generated by components like the catalytic converter and the exhaust system.

wle
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under driver seat is the coolest.

CJ Avlis
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brad wrote:
Under seat coolest, glove box 2nd coolest, middle console worst.

You and me got this!

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CalvinIS wrote:

My guess:


Blue: Below Driver’s Seat
Yellow: Center Console
Red: Glove Box


^ this
gcxmr2
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I’m going to go the opposite of the majority and say that:

Column E = Glove Box
Column D = Under the driver seat
Column C = Center console

pc_light
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I’m going to guess the Glovebox is Column C the coolest… because that’s where I store mine Silly

The console is exposed and higher up, so that would be hottest.

Seeking the light.

Watermanchris
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pc_light wrote:
I’m going to guess the Glovebox is Column C the coolest… because that’s where I store mine Silly

The console is exposed and higher up, so that would be hottest.


I have lights in the door (Pro Seeker2, FW3A 7a), center console (FW3A 1a), ashtray (S1R Baton I, Prometheus Beta), and in the back with my tools (Noctigon Meteor 219c, Olight H1R & H2R, a Black Diamond Storm). South Florida is brutal in the summer so I’m sure I shouldn’t be keeping all this LiIons in my truck but I like to be prepared for anything. Big Smile
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Watermanchris wrote:
I have lights in the door (Pro Seeker2, FW3A 7a), center console (FW3A 1a), ashtray (S1R Baton I, Prometheus Beta), and in the back with my tools (Noctigon Meteor 219c, Olight H1R & H2R, a Black Diamond Storm). South Florida is brutal in the summer so I’m sure I shouldn’t be keeping all this LiIons in my truck but I like to be prepared for anything. Big Smile
I hear ‘ya Watermancris, there’re other lights in the car, but only a thrower and a floody in the glovebox. There’s also a lighter plug-in corded handheld light (no batteries) and both a headlamp and a stand-up work light but they’re in trunk for emergencies, didn’t mention the trunk lights as it wasn’t part of the Poll Smile

Seeking the light.

Watermanchris
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pc_light wrote:
Watermanchris wrote:
I have lights in the door (Pro Seeker2, FW3A 7a), center console (FW3A 1a), ashtray (S1R Baton I, Prometheus Beta), and in the back with my tools (Noctigon Meteor 219c, Olight H1R & H2R, a Black Diamond Storm). South Florida is brutal in the summer so I’m sure I shouldn’t be keeping all this LiIons in my truck but I like to be prepared for anything. Big Smile
I hear ‘ya Watermancris, there’re other lights in the car, but only a thrower and a floody in the glovebox. There’s also a lighter plug-in corded handheld light (no batteries) and both a headlamp and a stand-up work light but they’re in trunk for emergencies, didn’t mention the trunk lights as it wasn’t part of the Poll Smile

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wle
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i just have a lithium primary light [CR123A] in the car
no temperature or leaking issues

i always carry something bigger, in pocket, like FW3A, and only get the CR123A while driving
wle

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I carry a softsided insulated lunchbox under my driver side seat.

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RESULTS Coolest place in the car.

And, naturally, jon has it right.

The center console was the hottest,
The dash glovebox in the middle,
And under the seat was the coolest.

I was leaning toward the dash being the hottest place till I saw the data.
On this car there is the airbag and AC ductwork between the glovebox and the hot dash or engine compartment. I’ll bet there is 10 to 12 inches of stuff between the box and the top of the dash.

The center compartment only has a thinly padded top. The sides are a single layer of plastic.

140+ degrees is darned warm. That’s warmer than tool makers say to use. A naked powertool sitting in the sun can certainly be hotter than that.

Yet there must be tens of thousands of cordless power tools baking away on jobsites across the country and I don’t really recall any stories of fires. Still, those batteries are not in bomb tubes (err flashlights).

All the Best,
Jeff

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Trunk

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nobody wrote:
Trunk

Nah, that’d be hot as Hellephant.

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In the radiator .

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nobody
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Lightbringer wrote:
nobody wrote:
Trunk
Nah, that'd be hot as Hellephant.
other studies like this show it is cooler

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