<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12px"><div id="yui_3_16_0_1_1433167227893_60852" dir="ltr"><span style="font-family: 'Helvetica Neue', 'Segoe UI', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 13px;" class="" id="yui_3_16_0_1_1433167227893_60965"> >If you hit only 50% depth of discharge, your battery should last for 1000 cycles or around 3 years. Cut it to only 25% depth of charge an you stretch the battery life to 6 years. </span><span></span></div> <div id="yui_3_16_0_1_1433167227893_60852" class="" style=""><span class="" style=""><br class="" style=""></span></div><div id="yui_3_16_0_1_1433167227893_67095">Solid advice. My extensive experience with field UPS's with zero reasoning behind the chemistry is that a UPS batteries, which generally are floating for their entire life with the exception of an occsional outage and rarely discharge completely, statisistcally have a life between 3-5 years. So it is interesting that the calculations show a possible correlation with extensive field performance data. </div><div id="yui_3_16_0_1_1433167227893_67090"><br></div><div id="yui_3_16_0_1_1433167227893_67094">John Vaughters</div><div class="qtdSeparateBR" id="yui_3_16_0_1_1433167227893_60958"><br></div></div></body></html>