I have BB8700g and I did have BBToday at one point on my device. I think I have 4.1 too. I also had the Zen theme at the same time. It worked fine. The BBToday screen would come up first and then if I pressed the back button, my regular zen theme would come up on the home screen.
As far as it draining battery life, yes it does. I had it for a week and all of a sudden my battery was draining quickly. Then I took it off, and instantly back to my normal, great battery life. Just so ya know...
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