Tripp Lite Smart UPS 400 UPS The Tripp Lite Smart UPS 400 UPS Battery requires 4 batteries to replace it. The price above includes all 4 of them.The Tripp Lite Smart UPS 400 UPS Battery cross-references to the below.Double check the actual size of the batteries being replaced. UPS replacement battery packs contain replacement batteries only. You must reuse your existing cabling and hardware. Although a wet/acid design is initially less expensive and can provide about10% more running time per charge than a sealed . . . Although a wet/acid design is initially less expensive and can provide about10% more running time per charge than a sealed battery of equal size, a Wetlead/acid battery has a much shorter service life, requires regular maintenanceand poses a much higher safety risk because of potential battery acid contactand/or explosion. Our sealed battery, instead, provides an inherently safer,truly maintenance-free design. Our batteries provide a significantly longer life-averaging1 to 2 years or longer when properly maintained. Our batteries are availablein models approved by major airlines and other public transportation providers. 1.43 6 3 2.6 1.3 4.09 1 Year SLA 1-2 days MK Battery Yes http://site.apexbattery.com/logos/tripp lite.jpg New F1 (0.187 Tab) M