wildfire shuts off

[buckxct]

I have the wildfire i get 3 hours on a set of batteries (duracell and energizer) with 30 degrees out. When the volume is on ten the green light flashes and it shuts off. When i play it on a lower volume like 7 it is fine. Is the batteries to low to play on volume 10? I put the batteries in my game cam and it says 50% good. I have 5 sets of these batteries all at 50% i guess i save them for my cameras. Should i get nihm rechargeable batteries will this help me out?