Because this is a vented battery we are unable to supply acid with it because of the spillage risk. This means that when you buy this product you will need to separately buy an appropriate quantity of Sulphuric Acid to activate it. For most typical motorcycle batteries you will need around one litre of acid and it is usually available from most good motorcycle/car spares stockists. Alternatively for £4.99 we offer a battery filling service for personal callers at our shop in Enfield, EN3. For full details of our shop location please visit the “Contact us” page.