If your battery is 4yrs old you should replace it regardless. Just don't get some cheap BS. Go to the HD dealer and get a nice AGM battery. Should run about $90-$100
Stay away from many other brands... Interstate are rebranded junk. YUASA blows nuts. I'll smack you if you got any auto store to get a fuckin tractor battery.
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-Chris
"Why pay somebody else to fuck up your bike?" 
Run Amsoil Product
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