snoproblem

This bike has a new battery. After riding for a week (2 hours back and forth to work) with no problem, while turned off for a momentary stop it wouldn't start again. After a day of sitting it started and ran for about 15 minutes then would not start. Cleaned the overflow from the battery (excess acid) and it ran like a dream for a day. Last trip after about 45 minutes on the road lights and instruments got dimmer and then went off completely and engine quit. Can anyone point me in the right direction at what to look for? Electric is not my strong point. Downloaded a service manual but doesn't seem to help. Thanks.