I'm having some problems right now with my 2005 Suzuki GS500F. I went to move it to a closer parking space and when I tried to start it, it seemed like the battery didn't have enough power to start the engine. I turn the key and the headlight comes on like normal, all the dash indicators work fine, and the turn signals work fine. You can hear the engine trying to turn over, but just not quite having enough power. Also, this is the second time it has done this to me in the past 4 days. The first time I eventually got it to start by messing around with the battery a little bit, just checking to make sure the battery connections were good; which they were. One second it wouldn't start and the next it started just fine. Over the next two days I didn't ride it but tried starting it periodically; which it did with no problem. Then today, it wouldn't start again. I tried everything I did last time, plus with access to tools, but had no success. Any suggestions on what is wrong?