Extend battery life on the HTC ThunderBolt by switching to 3G (disable 4G LTE)

For the past few weeks, I've been using my HTC ThunderBolt on 3G mode. Disabling 4G LTE and staying on 3G allows me to use the phone call day on a single battery charge (on a standard battery). If you're struggling to keep your ThunderBolt charged up, consider using the "LTE On/Off" app to disable 4G. I don't generally require 4G speeds, but it's nice to occasionally switch the 4G on so that I can download a 50 MB file in just a few seconds.