That's really weird because i had those 3 developer updates for my N9 and it felt like a huge battery improvement. I do loads of texting and web browsing. From the early morning charge till the evening it gets as low as 26%. It's my second day now (After the update) and the battery is still at 70% and I swear I used it as much I always do but it seems to hold the charge much better.

Maybe those updates change something within the Energy profiler and your update failed to do so?