Yuasa YB7-A, 12v 8Ah Motorcycle Batteries. L(mm) W(mm) H(mm) 135 75 133. Note: Before use this battery requires filling with sulphuric acid. The acid is not supplied with it because it is classed as hazardous material and it will not be accepted for carriage by our delivery agents. You should however be able to obtain suitable acid at any good local motor spares distributor.