I keep mine on all the time that it's parked in my garage.

 

Hooked up when I'm not riding.

 

The "Battery Tender" is the best known maintainer, but they're awful proud of them($). There's a lot of other charger makers that sell automatic maintainers, I have a bunch of different brands that do the same thing. Just make sure it clearly says it will not over charge the battery.

Lets see, I have a Schumacher, a Die-Hard and other brands. Usually 1 to 2 amps. They all do the same thing. I use them not only on my two bikes, but on my boat to keep the expensive start and deep cycle house battery on full charge.

 

I leave my tender hooked up all winter.
Being the non trusting type I am, I decided to check the charge rate after a few days of the bike being on the tender. When the tender was in float charge, the charge rate was .015 amps or about .2 watts- a totally insignificant amount of charge going on.
So, leave it on and don't worry. (This was a battery tender plus)

 

I ride, let the bike cool off and hook it up....on all the time when not riding.

 

Keep all my batteries on battery Tender Jr.'s Bike/ATV/Tractor/Boat never had a problem.

 

while we are talking batteries.. :0 I just discovered my 2012 fatboy lo has drained a second battery in 2 months and the battery light was flashing this morning.... Alternator maybe?

 

Set it and forget it. They will not overcharge. Some guys say they hook them up for a few days a month, the constant drain/charge cycle wears a battery down prematurely over time, albeit very slowly. Hook er up and fogetabout it.

 

I do! But then again I ride all winter. Florida, great in the winter, Sucks in the summer. My peak riding season is just starting.

 

My bikes are on a tender at all times when in the garage....all year round. Never any problems with that.