Beta 5 available... Go get it...
I don't have a problem with battery life. I just watched YouTube videos for the last hour or so and I'm still at 85%, granted I'm on a 7 Plus, still, I would consider bad battery life putting me in or under 70%.
I'm on a 7 and haven't noticed any issues with battery. On any of these 10.2 betas.
I'm posting two pics, of my usage....seems to be much better now, regarding battery.