Was out last night for a night ride and wound up stuck, as soon as i would try to run the winch in it killed motor, eventually i killed battery and had long walk home to fetch truck at about 2am. i suppose if i had used free spool to pull cable out that might have saved me but still. Anyways i am gonna get a new battery and suppose it will be optima since thats whats available at my parts store and was wondering which yellow top i should get, i have hid headlights, 2 55w back up lights, some led interior lights and a radio with 2 speakers, and do a good bit of night riding. nothing there seems to crazy to me to draw down a battery and i thought the smaller d51 should work but wanted some opinions. the 51 is like 450 cca and weighs 26lbs and the 31 is i think 750cca and 46lbs so a little weight difference and also smaller one is cheaper but let me know what u guys think.