WE all agree that 4g requires more Juice, but I am most likely battling 2issues:
1. Diminishd battery after ICS with new JB OTA ICS often gave me 30 hours plus, using same usage. And 4g was a battery drainer. However, 3G was not.
2. Weak cell signals' that I will monitor as I travel to and fro, in and around home, too.
Running 4G KILLS my battery! I run 3G most if the day. Why? It beats not having any data connection, and at least I still have battery life.
I'm not too happy about my Razr anymore.