Quoted: I called EOTech yesterday. They said the same thing: Alkalines, low temperature & batteries at low strength (but above the point where the EOTech will flash to warn you that they are low). They said that if I’m going to be in the cold weather to switch to Lithiums: a lot more battery life & more tolerant to low temperatures.
The Lithium batteries will probably address my concerns, but I am not totally happy about this answer. The first indications that I knew there was a problem was after my first shot. That wouldn’t be too good in combat. Luckily, I’m a wannabe range commando, which meant that I went home early & eat some popcorn.
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I've had Rev D,E and now F 552's and I've always used Energizer Lithium AA's and have never experienced any power issues with any my EOTechs.
With the rev F 512/552 the Lithiums AA's last a very long time, the battery time is basically on par with the Aimpoint ML2/M2. Also to be on the safe side I change my Lithium AA's once per year and have an extra set in my TD Battlegrip.
Another nice thing about the Lithium AA's is that it simplfies my battery storage logistics because it's the same battery I use for my digital cameras and other electronics.
I really believe that using Energizer Lithium AA's is the key to making the EOTech as reliable as possible under all conditions.