I've been using the MidNite Brat on a few projects and it's been brain dead easy to install and has been working great.
I recently bought a 12.8V 300 AH LiFePO4 battery from Renogy (https://www.renogy.com/12v-300ah-core-series-deep-cycle-lithium-iron-phosphate-battery-w-self-heating/)
Looking...