I just replaced the battery on my 2000 low rider 1450. After searching and comparing prices, warranty and cca, I ordered mine from Motorcycle superstore. The warranty was 1 year, which is better than the ones at advance, auto zone and other places PLUS the price was under $100 delivered. Got it on the 3rd day after ordering. Oh, and the cca's? 500. Huge amount.
I don't know if this is true or not but I have heard the HD batteries are a different spec to deal with vibration. Never any trouble with the HD. Ill save the money somewhere else and not worry.
Not to hijack the thread but I was just told that you should not leave a battery tender hooked up for more than a week at a time. His point was even after the battery was charged the tender was still charging and could damage the battery.
I use Interstate Batteries but I am also a dealer for auto batteries so I'm kinda partial.