OEM is best. Also if you want to get 5 Years plus out of your battery...Spend $40.00 on the Harley Battery tender. Also comes with jumper cables for quick jump if needed. Great set up.
I have never had a new oem battery last me more than 3 years always replaced with another Harley battery....I am curious how these mew lithium ion batteries work and I believer dry cell batteries are available now ...anyone know more about them?