I just put in a new battery because i thought mine was going bad, now im not so sure. After putting in the new battery i started the bike with the headlight pointing at the wall in my garage as i brought up the RPMs the headlight was dimming out and when it went back to idle the light was kinda flickering up and down and then go stable. My guess is when you bring the RPMs up it should go brighter NO????? whats up with ol speedy NOW any advice on charging