I'd go for some rechargeable batteries. Buying throw away cells will eat your
lunch with something that's a power pig. You could use NiMH, or the lithium cells.
You would also need a charger. But it will save you a load of $$$ over time.
I had the same problem with my trail camera that I use for critters in the woods,
and crooks here at the house. It normally takes internal C cells, and they were
eating my lunch. I also tried going to external D cell packs to get nearly twice as
much bang for the buck, but they were still eating my lunch.
Now I'm using a 12 AH SLA battery and all is well in the world.. Chortle..
I just recharge that bad boy every once in a while, vs going to the store to
spend $$$.
My Sony W290's use lithium-ion batteries, which are rechargeable. I can get
by with just one of those per camera in most cases. I have chargers both here
at home, and also one in the car. So I just top it off when the indicator starts to drop.
I use those for both still pictures and also video. The video probably saps the most
juice. Those batteries are about like the ones in most cell phones.
But... I still use alkie's in my Ace 250.. It's not a power pig, and I like
running it off the full 6 volts, vs 4.8 volts that you get off NiMH cells.
I get those cheap at the dollar store.. :/ Usually ray-o-vac golds..
My 250 seems to like those, and they last a good while.
