Advance 56100785 Terra® 4300B Four 310 Ah wet batteries and onboard charger, Scrubber Cart type Cast iron extension wing upgrade for UPC Product 633955055735 Country Cast iron extension wing upgrade for G1033 and previous versions of G1033Z that came with roller style extension wings Its durable construction and user friendly design make it well suited for industrial or commercial applications Wet Battery Technology: Wet cell batteries are traditional lead acid batteries that require periodic maintenance This combination of high capacity batteries and integrated charging makes the Terra® 4300B a robust and reliable choice for demanding cleaning tasks in commercial and industrial settings