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Battery life is usually calculated by the manufactures using the 80/10/10 or 90/5/5 rule.
This means that 80% of the time a radio is sitting idle, 10% of the time it is receiving, and 10% of the time it is transmitting - or 90%-5%-5%.
Obviously in a milsim, you will be transmitting and receiving far more often, thus reducing the battery life a fair amount.
Batteries are cheap, I have 3 1525mAh batteries for my radio and would suggest that anybody have 2 spare batteries for long milsims, especially if they are in a position where they need comms, such as command, platoon or squad leaders.
Most radios, low power means you will be transmitting at 1W, and high is 4W. This does not mean your battery will last 4 times longer on low, but it will extend the battery life a lot.
Of course, lower power means less distance, but any outdoor field you should be ok on low, when buildings or other large obstructions get involved, high is the way to go.
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