My little CBR has been giving me trouble if I haven't started it in a while. By a while I mean if I haven't driven it in a week, it's pretty much completely dead. I can roll it down a hill and pop the clutch, it starts up. I drive it, shut it off, and it starts right up, but if it is more than a few days in between starts, I may or may not be able to start it. Sometimes if the bike has been ridden only a few days ago, the starter tries to crank. Sometimes (like today) if it's been a week or more, it doesn't crank. Lights come on and power goes blank when I try to start it. I can't figure out exactly what's wrong but I think something is sucking the battery power... or my battery is just crap. Once about 6 months ago I left the lights on for 30 minutes or so and had to recharge the battery. After that it was still fine. The not starting bit started 2 months ago after an interstate move. I didn't drive it for 3 weeks and it was as dead as can be. After that, I've had problems. I didn't leave the lights on or anything like that. After the 1st time, I always check to make sure the engine is shut off and the lights are off. I have a LED system hard wired and a P3 brake lights wired in as well. The problem happened long after the LEDs were wired in but before I did the P3 upgrade, so I don't think the wiring we did was faulty. My guess is running the battery down, and leaving it in the cold rainy weather isn't helping. Would a new battery fix it? If so, will a bigger battery fit? size?