Hams use mobile radios to communicate with each other. All of these mobile devices use batteries to provide the power to operate. This page lists a number of resources that talk about batteries, and their use in Amateur Radio.
Lithium Iron Phosphate vs. Sealed Lead Acid Batteries
KF7IJZ provides a great video comparison of an AGM sealed lead acid battery vs. a couple Lithium Iron Phosphate batteries. These two batteries are A123, and Bioenno, respectively. Use this to compare these two technologies.