Originally Posted by Doc
Here's the link from Braille's factory page:
You could try the 17 lb B2317RP which is the same list price as the 15 lb and offers 1191 cranking amps instead of the 15 lb's 1067 ca if you wanted to go a few lbs lighter than the 21. The 21 lb B3121 lists for $32 more but offers 1380 cranking amps.
I still have the 15 lb battery installed. Whenever it needs replacing I'll replace it with a 21 lb at that time. Like I said, I put a float charger on it every couple of weeks just to keep it charged up because I don't daily drive mine. If you daily drive it the 15 or 17 lb battery would probably stay charged and work just fine.
I'm debating on which route to go. I no longer daily mine, I drive it on the weekends and sometimes on Friday. I don't have a float charger that I can use, so I'm thinking of going the 21 lb route.