Dan - BEFORE YOU RUN OUT AND GET A BATTERY - CHECK YOUR FUSES - DO NOT CHECK VISUALLY BUT WITH A METER. IN PARTICULAR, CHECK THE 25 AMP FUSE FOR THE HEADLIGHT CIRCUIT. I say this because you mention the lights going out. I played for 4 days trying to find out why all I had was a click. The fuse did not visually appear to be blown. It was and prevented the starter from energizing (some kind of 'feature'. You also mention the drain/voltage drop on the battery, so it could be something entirely different. Just the same, check the fuses before you panic and spend a bunch of money.