I went by HF today on my road trip and picked up one of the 18Vs. It's a different model battery with a stick up pose so I will have to get creative mounting it.I opened it up and looked to see how it is set up on the inside, I can just solder on a couple of posts for quick disconnect and charging or just solder on an extra connector as a charge plus. This should be a trick and really should look like hell!!! Oh well, my starters aren't pretty girls anyway. As long as the motor goes zing I'm happy.