Marshall Distributing offers you two quality battery brands. Fire Power® is available in Polymion and Yuasa is available in Yumicron and Yumicron CX. POLYMION and YUMICRON batteries deliver high performance with two extra plates per cell for a dynamic 30% improvement in cranking performance. This power advantage is especially important for modified machines with high compression and exotic carburetion. YUMICRON CX: Because of the lower internal impedance inherent in the YuMicron CX design, the CX will generate 5% to 8% more cold cranking amperage than our own high-output YuMicron lead-antimony battery. This means greater reserve capacity as well as lots of punch for today s big complex machines.