I have a 2010 Nightster, EFI. Swapped plugs, changed oil and oil filter. Ready to ride next morning didnt have trickle charger on and got hit with a cold snap. I don't have a garage figured the cold beat the battery. I am in Las Vegas so our coldest bottomed in the teens for about two weeks. We're are warming up and recently noticed she will start when the sun is out but not after it goes down. Figured it was cold related until tonight. It is still in the 60s where the am is in the low 40s. Im at a loss. I know otheres have mentioned cold weather starts. Any ideas? Anyone?

 

My car has issues when it is single digits. There is a value called cold cranking amps (CCA) that defines how many amps a battery puts out a 0*C when it is tested. Motorcycle batteries aren't that strong to begin with, but your battery could just be getting ready to go.

Even a brand new 2010 model could have a battery that is 1 or 2 years old in it, which means your battery could be 3-6 years old already. Check the voltage in your battery and make sure it is up to spec and go from there.

 

Buddy in vegas just had same issue. New battery solved his dilemma.