<html><head></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1479953140759_2601"><span>Hank,</span></div><div id="yui_3_16_0_1_1479953140759_2639" dir="ltr"><span id="yui_3_16_0_1_1479953140759_2638">the main advantage with AGMs is they don't spill.</span></div><div id="yui_3_16_0_1_1479953140759_2800" dir="ltr"><span id="yui_3_16_0_1_1479953140759_2799">I did try to compensate my batteries with overpressure</span></div><div id="yui_3_16_0_1_1479953140759_2766" dir="ltr"><span id="yui_3_16_0_1_1479953140759_2765">from a bike inner tube that I pumped up. It failed.</span></div><div dir="ltr"><span>I think it didn't like the compensating oil & was dissolving</span></div><div id="yui_3_16_0_1_1479953140759_2801" dir="ltr"><span>a bit, & leaking.</span></div><div dir="ltr"><span>If you look up the instructions on the "Sea Battery" I think</span></div><div id="yui_3_16_0_1_1479953140759_2803" dir="ltr"><span id="yui_3_16_0_1_1479953140759_2802">they do what you are suggesting. I know they bleed off</span></div><div id="yui_3_16_0_1_1479953140759_2806" dir="ltr"><span id="yui_3_16_0_1_1479953140759_2805">excess gas from a valve in the diaphragm.</span></div><div id="yui_3_16_0_1_1479953140759_2828" dir="ltr"><span>Alan</span></div><div id="yui_3_16_0_1_1479953140759_2804" dir="ltr"><span></span> </div><div class="qtdSeparateBR" id="yui_3_16_0_1_1479953140759_2570"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_1_1479953140759_2865" style="display: block;"> <div id="yui_3_16_0_1_1479953140759_2864" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div id="yui_3_16_0_1_1479953140759_2863" style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"> <font face="Arial" size="2"> <hr size="1"> <b><span style="font-weight: bold;">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Thursday, November 24, 2016 2:11 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] battery compensation<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1479953140759_2862"><br><div id="yiv4372837487"><div><div style="color: rgb(0, 0, 0); font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><div id="yiv4372837487yui_3_16_0_1_1479949641924_2823">Alan,</div><div id="yiv4372837487yui_3_16_0_1_1479949641924_2823" dir="ltr">I have figured out a way to use AGM batteries with oil compensation and NO need for 2psi relief valves. The rubber bladder on top can act as a pressure source. Just size the membrane to create tension by over filling with oil. Might work, but I am not sure what the benefit would be by using AGM's -they are actually heavier than lead acid.</div><div id="yiv4372837487yui_3_16_0_1_1479949641924_2823" dir="ltr">Hank</div></div></div></div><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a id="yui_3_16_0_1_1479953140759_2861" href="mailto:Personal_Submersibles@psubs.org" ymailto="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></div></body></html>