Check Gmanindustries.com. When I had my Intruder I put one of his batteries in. Was in for six years when I traded the bike for the Burgman a few weeks ago. Nice thing is that the things thrive on the cold. Put the bike away for the winter and never put a tender on it. Fired up first thing every spring. No, they're not cheap but because removing the battery on the Intruder was such a pain it was worth it to be able to just put it in and forget it.