If your having short battery life issues with your thunderbolt, I would suggest buying some cheap batteries off ebay and carrying a fully charged battery with you throughout the day. If your phone runs low, just swap the battery for the fully charged one. Most packages come with a wall charger just for the batteries, so it makes having extra, fully charged batteries very simple. I bought two 1500mAh batteries and a wall charger off ebay for $10 shipped. Yes, they aren't really 1500mAh batteries, but they do last me a good 6 or 7 extra hours after my OEM battery runs out. When I have a fully charged, extra battery in my pocket, I'm never afraid to use my phone to it's awesome potential.