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[Phil Thien]

Edit: so The Man must be tracking me. Today's Woot: First Alert ONELINK Wireless Smoke Alarm 2-Pack $39.99 + $5 shipping
http://www.woot.com/

That woot was what kinda led me to the question. The Amazon review of that product said it was a battery eater.

[Matt Meiser]

Phil, I'll ask my dad about battery life and model when I'm at their house this weekend. They've been in for a year now so he should have a pretty good idea.

I'd hazard a guess though that any wireless system is going to use more battery power than a non-communicating smoke alarm because they have to power the radio. It doesn't have to be transmitting all the time, but it does have to listen. Buying more batteries would be the tradeoff of having to run wire in a retrofit.