I want to install a headlight, turn signals and horn to my machine. I want to know which SLA battery you guys would recommend, and how to charge it. I have a key switch wired up, which will disable everything from working when it is turned off. For the battery, I was thinking that there are a few alarm system batteries at my local hardware store for as low as $18. I'm thinking i'll just use the battery that fits on my bike the best, or that I can find a case for. But how should I charge it?