One of the guys at my field just has a gel cell battery connected to his starter with a roughly 4' cord. I think it's soldered together, or at least well connected. he just picks up the battery, puts it in front of the plane, just to the side, and starts, then picks up the battery and moves it and the starter to the side. I think I'd find it awkward, but he likes it. And if his engine dies while taxiing, he just runs back and grabs the battery and starter and brings it to the plane. Whatever works.