I dont think its a small drain. I was using a few programs that manage to keep my EVDO connted almost constantly (a stock program and Weather Panel) and my battery life was terrible compared to when I scaled back the updates on those programs to every few hours even though they would just connect update and then were done. I may be wrong but the radio seems to be a major drain on the battery, maybe not as bad as WiFi or bluetooth but still bad.
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