I've got a helix 10 msi g2 and helix 10 di. I'm thinking about getting a small lithium battery just for these to run off of. I'm trying to figure out what AH battery I need to get. I don't have room in my bilge to put a group 27 or larger for my cranking battery so I'm limited to a 24 on it. Just trying to get some load off of it.