Relion is a battery manufacturer. They specialize in Lithium Iron Phosphate technology (LifePo) and also produce a nice line of deep cycle absorbed glass mat batteries AGM. Some of the difficulty in the implementation of LiFePo batteries is their inability to be charged at cold temperatures. However, some of the cutting edge technology that Relion has to offer includes an internal heater built right in to some of their 12Volt batteries that will use power being generated from a solar charge controller or any battery charger to heat up the battery. Then start charging it when the battery gets to the right safe battery charging temperature. Very smart! Lithium technology has become extremely popular in the last few years because of their inherent ability to be extremely deeply discharged without any real repercussions in lifespan. This means that we can use about 80% of the power stored within, literally every day, and still get a very long life span out of them. However, just like any battery or battery bank, the less deeply you cycle them, the more life you get out of them. It is still very important to be mindful of how much energy is actually required for use in a day. Relion also makes some extremely robust Lithium Iron Phosphate batteries with larger amp hour capacity for 12, 24, and 48 Volt battery banks that are perfect for use in Renewable Energy and solar electric systems. They can be used for either Grid Tied back up systems or for whole house energy in off grid applications.