Yuasa has developed a more compact, higher cranking, spill-proof, maintenance free battery. This new generation in battery technology provides many benefits to motorcycle and scooter users. The YTZ batteries pack more power, discharge less in storage and have a longer life than conventional batteries. Best of all, our spill-proof design and construction prevents leaks - making it the safest alternative for your vehicle needs. The YTZ battery has passed vibration and pressure differential spill-proof tests required by the I.A.T.A. (International Air Transport Association).