<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div></div><div>AGMs are hard to compensate because they need 1-6psi internal</div><div>pressure to re-absorb their gasses. </div><div>I had them in my ambient & used two one way 3psi cracking pressure</div><div>valves ( one letting air in, one letting pressure out) to maintain at least</div><div>3psi inside their housing.</div><div>I also used pure silicone oil to limit the volume of air needed. Cheap </div><div>Scented silicone oil caused them to off gas. BTW they lasted for years.</div><div>Alan</div><div><br></div><div><br>On 26/05/2019, at 11:34 PM, Jon Wallace via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1558868781939_17995"><span id="yui_3_16_0_ym19_1_1558868781939_18048">This was my understanding also, that AGMs don't vent under use. Charging, yes, but the box could be opened or vented during charging. I wouldn't be using regular wet-cell in this application.</span></div><div id="yui_3_16_0_ym19_1_1558868781939_17995"><span><br></span></div><div id="yui_3_16_0_ym19_1_1558868781939_17995"><span id="yui_3_16_0_ym19_1_1558868781939_18488">Hank, if the enclosure is designed to have limited tolerance to the dimensions of the batteries the air volume would be within reason I think. I suspect .25 cu ft or less.</span></div><div class="qtdSeparateBR" id="yui_3_16_0_ym19_1_1558868781939_16973"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1558868781939_16941" style="display: block;"> <div style="font-family: times new roman, new york, times, serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1558868781939_16940"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1558868781939_16939"> <div dir="ltr" id="yui_3_16_0_ym19_1_1558868781939_16938"> <font size="2" face="Arial" id="yui_3_16_0_ym19_1_1558868781939_16942"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Brian Cox via Personal_Submersibles <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <<a href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> <br> <b><span style="font-weight: bold;">Sent:</span></b> Saturday, May 25, 2019 10:18 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [PSUBS-MAILIST] Air comp battery compartment<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1558868781939_16943"><br><div id="yiv0221322001"><div id="yui_3_16_0_ym19_1_1558868781939_16947"><div style="font-family:Arial, sans-serif;font-size:10pt;" id="yui_3_16_0_ym19_1_1558868781939_16946"><font size="2" style="" id="yui_3_16_0_ym19_1_1558868781939_16945"><font face="Arial, sans-serif" id="yui_3_16_0_ym19_1_1558868781939_16944">If you could use AGM batteries there would not be the explosion issue.</font></font><div id="yui_3_16_0_ym19_1_1558868781939_16948"><font face="Arial, sans-serif" size="2"><br clear="none"></font></div><div id="yui_3_16_0_ym19_1_1558868781939_16949"><font face="Arial, sans-serif" size="2">Brian</font></div><div id="yui_3_16_0_ym19_1_1558868781939_16950"><font face="Arial, sans-serif" size="2"><br clear="none"></font></div><div id="yui_3_16_0_ym19_1_1558868781939_16951"><font face="Arial, sans-serif" size="2"><br clear="none"></font></div></div></div></div><br></div> </div> </div> </div></div></div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>Personal_Submersibles mailing list</span><br><span><a href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br><span><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br></div></blockquote></body></html>