First of all the bike is a 2010 w/54 total hours, so wasn't used much till recently (bought 3 weeks ago w/43 hours), ran well, started ez, now the cooler weather is settling into central texas, the batt maybe going south. today it started, ran 5 secs (w/out choke) and died, tried to restart but not anywhere near enough juice to crank engine. so i figure a 4 year old batt (bike was built nov 2009) is about it as far an expected life, so time for a new one. walmart? which 'type' or size do i aim for? i'm looking to go buy one later this evening. thanks.