I have a moultrie feeders cam.

I had a Problem with reg. batteries going dead quick in cold weather.

I bought 4 energizer lithium AA bats. put 2 in the cam and two for backup. I was gone for 8 days. when i got back everything worked just fine. It was also in the low teens while i was gone.

on the package it says these things are rated to 40 below. they are expensive. like 7 bucks for two.