Hi,
Shorten the Starter wires and get the Battery as close to the Starter as you can. My Starter is mounted directly on the Battery and nylon Ty-Wraps hold it secure.

Cut the wire leads about 6 inches from the starter and attach a good size Alligator clip to each starter wire. Connect each alligator clip directly to your 12V, 7aHr fully charged battery. The short wires will reduce the resistance and give much more power to the starter.

Ken AMA 1528