My 2006 goldwing sat for a year with no battery tender. Battery measured 6 volts open circuit. I charged the battery for 5 days with a 2 amp charger. When I checked the voltage of the battery open circuit after 5 days it read only 10 volts. My charger is good I checked it by charging another battery. The battery charger current meter indicated 2 amps current draw with the other battery but with the motorcycle battery it only indicated 100 milliamps. I also checked everything with my fluke meter current draw and voltage of battery charger and battery everything ok. So motorcycle battery looks like it needs replacement. Anything else to check?