Battery Tender Jr. is Fine
Wingman mentioned the Jr. won't do the job, but I disagree. I've had the Tender Jr. on my 1800 for almost 18 months now and certainly have not have any problems with it. Now I will say the 1800 does a great job of charging the battery, but then, when I'm working on the bike and running the 400 watt amplifier, it's killed the battery a few times and the BT Jr. has always brought it back!