I am wiring my trailer up with a 7 pin harness and installing a battery on the trailer that can charge while I am driving my truck. My dad runs an Autozone and had the chance to pick me up a Duralast Marine Dual Purpose battery for cheap. I am trying to figure out how much I will be able to power off of this battery and am trying to figure out exactly what the ratings stand for. I know amps = watts/volts and how to figure out how much power I will draw. I am trying to figure out if the battery is only 106 amp hours or is it 316 including the reserve and where does the MCA and CCA come into play? I plan on using it to power my lights, maybe a radio, small fan or whatever else I can get out of it which I can figure out once I can figure out exactly what the capacity is that I have to play with. I will be running the lights and phone charger off of it at minimum and have a small inverter that I want to use if I can. The battery is a Duralast 29DP-DL and I can't really find any info on it online.