Given what we know about specs, what battery life is okay?

It should be pretty decent, it has none of the Google framework to deal with! The 720p screen will save power and still look good, at least it does on my flex

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has been using it for a week, with google framework and google play store installed.

And the battery is great: considering I have been using LG G2 at the same time. The amazon fire phone battery performance is only a little bit less than LG G2.

Note: I turned off all the dynamic perspective. because it makes me feel dizzy =DDD
 
I find battery life to be exceptional. I'm not running anything google on it so I don't know if that would make a difference. I'm on 4LTE for at least12 hours out of the day. Using email, web, maps, phone and maybe an hour or two of video and I'm always above 70% at 16 hours. I leave everything on with the exception of BT which I don't use.

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And when I text a lot, and make many calls (and still have WiFi on) it lasts for about 15 hours.