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How much can a ota update change battery life though?

there are several factors in the software that could effect that. I don't know all of them. Some would be:

* how the system accurately reads AND displays the battery stats.
* the efficiency of the hand-offs between the different radios when swapping from 4G/3G/wifi
* Proper use of any built in governing architecture for the processors (a lot of custom kernels shut one core down while the screen is off which in my experience has really really helped battery life)
* Improvements on the charging system which would also go together with my first bullet. This is probably why you see a lot of people saying "hey i can't charge my phone past 99%"
 
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