My bike come with the pre-wired battery pigtail. My wife's bike never had that and the first couple of years used an electronic selectable battery charger. That was a pain in the *** cause the side cover had to be removed, and the factory clips are marginal. I then got the HD auto tender, and it come with the pigtail to connect to the battery, which went on her bike. Soooo, during the winter I will simply plug it in 1 bike for 2 weeks, then switch it to the other bike. It's great cause I don't have to remove seats or covers.

 

Every couple of weeks in the winter I will plug my tender in. Before I leave the garage, the green light is on so I unplug it. I changed my last battery after 5 years and put it in my riding mower. It's been working there for two summers without the tender. Batteries lose less charge in cold than they do in heat.

 

Anytime I'm not riding (year round) and the bike's in the garage it's on my battery tender jr

 

When my bike is home I’m hooked up to one