I was setting the phone up (syncing contacts 2,173) - setting up my corporate email (syncing 30 days worth of emails) installing all my app's back on, setting up my desktop's like i wanted them, playing words with friends. Brightness was on 30% (Sync every hour on GMail and Corproate exchange) bluetooth headset for 30 minutes of voice calls browsed the web (looking at my bracket) did multiple speedtests (hotspot for 20 minutes).
I'm talking crazy long battery life (i was hoping it would be die overnight) so I could plug it in and charge it back up. I'm trying to let it die before I plug it in. But the sucker won't die.
This is almost 2x as long battery life. I was actually so surprised I was gonna pull out my battery and see if they swapped it with a larger capacity battery when I got the new one.
No idea whats going on but my best guess is that they fixed the 4G battery drain that was happening on my first one. Because my old one sitting on the table doing nothing would drain about 10% every 30-45 minutes with just 4G on (no syncing enabled) It was so bad I would turn off mobile data completely to conserve life when I knew I would need it turn it back on. Now i can leave all my settings normal and keep it on 4G!