Well I finally bit the bullet and did the nasty. So seems like my battery life is back to normal, but too soon to tell for sure yet. The big surprise to me was that I gained 15G of space. I am a pretty good manager of space and don't have tons of garbage lying around, but after reloading all the apps and setting all the settings and putting my pictures and music back on, I had 15G more available than before the reset. Beats the hell out of me how the various cashes could have used that much but I will say that this is the first reset since the phone was new, about a year ago, whereas my last phone, a S4, had to be reset about every 3-4 months to keep performance up.