Are you satisfied with your phone's battery?

I own an iPhone 6 and I am overall satisfied with the battery performance. Of course the battery duration is based on software, hardware and environment factors.

Software as in Operating System resources that draw battery power as well as how much battery power an app consumes.
Hardware as in how large battery capacity there is as well as how much power demanding a device is.
Environmental factors as in how hot or cold is outside (too hot = overheat).