I've been getting BETTER battery performance due to the increased signal strength. You might want to grab my Signal Location utility from http://www.blackberryforums.com/afte...erry-beta.html
and double check that you're actually parked on the Airave. Do a "show cell site location on map".
The last time my device did that, it was when BBWeather was having problems with weather.com and it was retrying continually.