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These two sealed batteries fit. My Westco worked well for 4 plus years. The second option is a lot cheaper and basically the same as the 20AH Westco. Fits and works as well according to several second hand reports. Will be my next battery.http://www.westcobattery.com/battery_page.php?bid=6&vid=1&mid=16http://www.beiterbattery.com/toyo12volt1820ahslabattery.aspx