My Thunderbolt Battery Drain Crisis Is Over. So Since Sunday Ive been running my phone in 3G vs 4G. And Man what a difference. Im averaging about 14 hours of battery time in 3G with Moderate to light use. And about 10 hours with Heavy Usage. If I stick it in 4G Forget it.. It just sucks the battery down in about 2 hours. I love my Thunderbolt. and Im confident some how there will be a software patch to fix the mega drain while on 4G. I work in a Radio Shielded building because of all the Radar sites around where I work. And I still am able to get about 2 bars of 3G inside, even in the basement. Took the Charger off around noon, and I got home at midnight and it was at about 33% battery left.. not bad considering. It gets "Almost" as good as my Moto Droid did. Its sucky that you cant turn 4G on. But I can live with out it since I dont use the mobile hotspot or Tether. I really cant tell a difference surfing the net on my phone between 3G and 4G. not till I hook up to my PC then I see a HUGE difference. So all in All.. Turn your 4G off and your Battery will be fine. and then pray they do something to allow the 4G not to suck the battery down.