I use the "Battery Tender Jr." by Deltran. My battery is in my basement now on a two by six board hooked up to the BTjr.
A little more expensive than the Harbor Freight one, I paid $39.95,
but I'm happy with it. Switches automatically from charge to float.
Now 2010 V STAR 950 T
Former bikes were
1982 Yamaha XJ650 Maxim
1977 Harley Iron Head Sportster
1970 Triumph 500 Hard Tail Chopper
4 wheels move the body, 2 wheels move the soul