Yuasa YTX20L-BS Maintenance Free VRLA Battery for 1991-2008 Harley Davidson Touring Models Comes with pre-measured acid tubes that customer easily empties into battery. Includes a seal that is then placed across the top of the battery to create a sealed, spill-proof battery. Customer must add acid (acid not included)and charge manually or through their local dealer before installation. If the customer wants to manually fill the battery, they are advised to wait an additional 10 minutes between adding the acid and sealing the battery, to prevent cracking the shell. Never needs refilling but may need periodic charging.