There's a more active thread over at CB that's also discussing this issue. It all seems hit or miss, but Samsung devices seem particularly susceptible, although other models are also being affected. Shutting off the persistent icon in the notification bar is helping at least some folks. Of course, the problem with doing that is that Android could shut down the app if memory gets low, and that's not something you want to happen.
Hopefully the update that was just released addresses this. I guess we'll see.
http://forums.crackberry.com/bbm-and...-drain-863496/