<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">Begin forwarded message:</div><br class="Apple-interchange-newline"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">From: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">Jeff Myles <<a href="mailto:jeff@rollsbattery.com" class="">jeff@rollsbattery.com</a>><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Subject: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><b class="">Re: [RE-wrenches] Battery Specific Gravity versus Electrolyte Level</b><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Date: </b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class="">February 9, 2021 at 8:54:04 AM EST<br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">T</b></span><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif;" class=""><br class=""></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=""><span style="font-family: -webkit-system-font, Helvetica Neue, Helvetica, sans-serif; color:rgba(0, 0, 0, 1.0);" class=""><b class="">Cc: </b></span></div><div class=""><div dir="ltr" class="">The main reason the manual instructs not to top up all cells before equalizing is to avoid overfilling to/up in the vent and having a spillover when they bubble. <div class=""><br class=""></div><div class="">We suggest inspecting and topping them up after because they also go through water running the equalization. If a cell is noticeably lower than others it would make sense to top it up slightly to bring the electrolyte to a similar level as the others before beginning the process. If it's just one cell in the bank I would expect the SG reading on that one will be off from the others to begin with. If it's going through more water than others it's getting hotter. Why?<div class=""><br class=""></div><div class="">Lower liquid level doesn't always equate to higher acid concentration. The SG reading in the cell with lower electrolyte would only read higher than others if the cell, like the others, wasn't suflated. If it is sulfated, the SG readings at full charge are lower because the sulfate has accumulated on the plate and not released back into the electrolyte during charging.<br class=""><div class=""><br class=""></div><div class="">First, he should check all cells at float charge before beginning the equalization so he knows where they're all starting from. <span style="background-color:rgb(255,255,255);font-family:Arial,Helvetica,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;color:rgb(34,34,34);display:inline!important;float:none" class="">Is the cell with the lower </span>electrolyte level reading higher or lower SG than the others? Are the rest completely balanced and this one is off?</div><div class=""><br class=""></div><div class="">SG readings immediately after equalization and before adding water will be elevated due to temperature. To get accurate readings after adding water he should cycle the batteries 2-3 times, allowing it to mix normally, and then check SG at float charge. SG results after an equalization are accurate after the bank has been cycled a few times. If cell(s) were sulfated, they will continue to desulfate as they're cycled normally so the results aren't immediate.</div><div class=""><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><table border="0" cellspacing="0" width="100%" class="">
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