I am totally battery illiterate and need some help. I purchased a tw 200 in may, the guy had just put in a new battery. I rode it a few times, started it up a few times but have left it on a Black and Decker battery maintainer for the last few months. the green light indicating full battery has been on but when I tried to stat it recently the battery was completely dead. took it out and no acid in it. refilled the acid, put it back in the bike and back on the maintainer. flashing green light indicating re-charging. after about 2 days the lights worked and it almost started. left the maintainer on until the light was steady green and guess what? completely dead battery and out of acid. what did I /am I doing wrong?