I posted this already, so I'll just paste it here and save myself some typing.
I have no way of proving it to you all, but my informal testing (25R vs. 30O) I had similar battery life. My test method was similar but not lab quality: off the charger at 6am and back on at ~ 11pm. Usage pattern - hammer the phone all day long. Not egregious screen on time (say 5 to 6 hours) but I USED the phone. SMS. FB Messenger. FB. Twitter. GMail. Exchange email. Podcast Republic. Youtube (some). Just regular day to day use, not trying to prolong the battery unnaturally. Both scenarios had ~20% or so left at the end of the day, I'm satisfied.