What's the 9900 battery life like with 7.1 software?

Not so long back I had a blackberry 9900, and I can honestly say it was the best phone I ever had! But the only thing that let it down was the battery life. I got up to 12 hours on a good day. I had to cut my usage of the phone so I was a light user, wanna be heavy but cautious of battery life!

I never had the chance to update the software to 7.1 because it was not released at that time I had the bold! I sold it and got myself an iPhone 4S, which I must say the battery was great on it, but the iPhone is just not for me, I'm a blackberry user!

What I'm asking is, what's the battery life like now with os7.1? How many hours are you users getting? Is there even an improvement? Or should I go with the other bold touch which is smaller, 9790?

Thanks:D

Usually a full day.