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The infamous they say every two years is all you will get out of a motorcycle battery. A buddy of mine has a 2002 RKC which he bought new and hasn't had to replacethe battery yet.
My 03 has the orig battery. Bought the bike 1 1/2 yrs back with 2.500 miles and now has about 16k on it. It never sits for more than a week or so, never had a charger on it, and fires right up even when temp is in the 30's. I think havin a carb makes the battery last longer.
My '05 Ultra has the original battery. Yesterday I noticed that the voltmeter was sitting on 15-16 volts, higher than normal (13-14), even after riding a while an it should be charged.. I haven't noticed sluggish starting or anything else. Is this higher voltage reading an indicator that it needs replacing?
Thanks
Battery life is generally 5 to 7 years and there are a couple of ways to check them but I tend to agree with electarick as after 4 years you will want to check battery often or just get a new one--my .2 cents
Alot depends on your climate and riding habits and whether you keep the battery "tended" between uses. Frequent short hops around town with many restarts are tough on a battery. Another battery killer is heat, battery life will be shorter if you live and ride in a hot climate.
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