Question about keeping batteries warm during winter outdoor shootings?

3 months 3 weeks ago #711047 by Red Tail
Can I use hand warmers sitting directly on my batteries that are not being used?  For example if I have 2 spare batteries and stuff them in my pocket with a hand warmer, will that be OK, or will the handwarmer be too hot for batteries?

I know (think), these things are temperature sensitive?  


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3 months 3 weeks ago #711061 by Nikon Shooter
Temperature sensitive for sure as the energy is coming from a
chemical reaction that is better served when not cold.

I had to face the same problem and opted for another solution:
an external power pack that I keep on my belt — inside my coat
with a cable that runs in my sleeve and attach to my camera.

I built it myself with 16 Eneloop cells: 2 parallel groups of height
cells in series.

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3 months 3 weeks ago #711123 by CharleyL
I have some plastic cases designed to hold 4 AA or AAA size cells, and carry several of these cases and a similar sized case for a pair of camera batteries in an inside pocket when out shooting in very cold Weather. I also try to keep the camera and flash in a padded (insulated?) but not heated bag when it's not actually in use. I want the camera and lens to be near the outside temperature so the lenses don't fog. Cold batteries can be changed out with those from the pocket, if they get too cold.

I haven't needed to do this lately, because I'm rarely shooting in cold Weather now, as I'm spending much of my shooting time in my studio where it's nice and warm. Here in North Carolina it just doesn't get cold enough very often to even worry much about the batteries if I do go out. Winter afternoons here are almost always well above freezing. At 10:20 AM today it is 45 deg F outside and headed for a high of 55 F. Not near cold enough to worry about batteries.

Charley
 


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3 months 3 weeks ago #711201 by Garbo
Those hand heaters don't get that hot, IMHO you'll be fine. 

Nikon D300: 24-70 2.8 | 70-200 2.8 VR |Sigma 150 2.8 | 50 1.4 | SB-800
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3 months 2 weeks ago #711256 by TCav
Keep them in an inside pocket of your coat.


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3 months 2 weeks ago #711272 by Gammill
Do batteries need additional heat other than our body tempature?  


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3 months 2 weeks ago #711279 by Nikon Shooter
No, it is a chemical reaction that is doing just fine at +/- 20°C.

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