Additional plates inside battery provide up to 30% more power (cranking amps) than the Yumicron battery. Dealer fills battery from included acid tubes to create a sealed, spill-proof battery. Never needs refilling. High level of power (cranking amps) possible for todays big bikes. 1-year manufacturers warranty. Includes 10mm spacer for use in replacing YB14A-A1 and YB14A-A2.