I actually just posted about this topic on my FB page. I replaced my Optima with a Big Crank ETX30L AGM this season. Weight is 24 lbs and is half the price of a Braille B3121.
https://www.batterymart.com/p-Big-Cr...qWOStM0Zl4z-xU
I received an email for 8% off if you enter "8offaug" this month.