Foxpro Shockwave freezing batteries

[MatthewKoelling]

Hey fellas,
Has anyone else had problems with batteries in the call freezing up at 5°F or lower? My Shockwave will run for a 5-10 minutes and shut off. Once it warms back up in the truck it will run a while longer, but gets worse as the night goes on. I was going to try putting a hand warmer packet in with the batteries, but has anyone else had similar issues?

 

[Dew Claw]

It was -1 below here last night and mine went dead in my Fox pro. I replaced the batteries and did call 2 in.

 

[Dew Claw]

I have a bunch of hand warmers because 10 years ago I would put one under a sleeve on my thermal scope. Good idea, I will try putting one on the batteries when it's cold.