i have a 2005 tc250 and i have it plugged into a battery tender all them time when im not riding it. but the battery looses juice quick. like ill start the bike let it run then give it throttle to fast and bogs and dies so i try to restart it and no go then gotta hook it back up and wait. but once ive been riding for a while and the bike is hot it cranks good. you think i should buy a new battery?