Battery update.
I've had a day off work today (I have to switch my phone off in work, and I work 12 hour shifts so monitoring battery use has been difficult), so today is my first real opportunity to test it fully. I've ran the phone all day from about 6am on the same charge, on its been on the house WiFi, but I've used it to text, make phone calls and browse the internet, and it's now 8pm and I've still got 45% battery left.
I've had a few apps update since installing this new build, so that may have helped matters. All I can say then is give this fixed version a go, but stick with it. It was faster and more reliable from the word go, but now the battery usage seems to have improved too over the days since I update.
I hope this information helps.