<div dir="auto">Fro. My experiance yes</div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Mar 11, 2026, 12:57 PM Steve Higgins via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><p><font color="#000000">Self-discharge (No Load) is typically around 1–2%, depending on temperature and pack chemistry. Higher temperatures will accelerate this, but it generally caps out at around 3-4% under worst-case conditions, usually because the BMS shuts down the battery if temperatures get too high.</font></p>
<p><font color="#000000">The bigger concern is prolonged exposure to temperatures above 45 °C. At those temperatures, you will begin to lose overall cycle life, which can cause pack swelling, even if the batteries are just sitting in storage. Based on current observations, that loss can be up to roughly 2% of overall cycle life per year when exposed to those elevated temperatures.</font></p>
<p><font color="#000000">Unfortunately, there isn’t much comprehensive testing available yet. Right now, we are conducting cold-weather testing to better understand how these batteries are affected by low temperatures and what kind of long-term damage cold exposure may cause. We’re seeing some preliminary results, but complete data will likely take another 5–10 years to fully develop.</font></p>
<p>We are currently observing that LFP batteries start to degrade at temperatures below about –5 °C. The impact seems to average around 1% additional degradation per year in both cycle life and capacity at those temperatures. Prolonged exposure to -20 °C and below, you can also see swelling from electrolyte freezing. </p>
<p><font color="#000000">One thing that is becoming increasingly clear through this testing is that cell manufacturers’ published data often does not fully reflect real-world performance, particularly in long-term environmental testing.</font></p></div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><table style="width:490px;border-width:1px;margin:0px auto 0px 0px;height:155.5px" border="1"><colgroup><col style="width:123px"><col style="width:366px"></colgroup>
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<div style="text-align:left"><span style="color:rgb(216,0,29);font-family:arial,helvetica,sans-serif;font-size:8pt"><strong>Steve Higgins</strong> <span style="color:rgb(0,0,0)"><strong>⋅</strong></span> <span style="color:rgb(0,0,0)"><strong>Technical Services Manager</strong></span></span></div>
<div style="text-align:left"><span style="font-family:arial,helvetica,sans-serif;font-size:7pt;color:rgb(216,0,29)"><strong>t</strong> <span style="color:rgb(0,0,0)">+1.902.597.4020</span> <strong>m</strong> <span style="color:rgb(0,0,0)">+1.206.790.5840</span></span></div>
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<p> </p></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 11, 2026 at 10:20 AM Chris Schaefer <<a href="mailto:chris@solarandwindfx.com" target="_blank" rel="noreferrer">chris@solarandwindfx.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Steve, what is the self discharge on Lithium Iron Phosphate (LFP)?<div><br></div><div>Christopher</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 11, 2026 at 11:26 AM Steve Higgins via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Typically, AGMs self-discharge around 2-3% per month at 25 °C. Higher temps accelerate this, lower temps slow it down. </div><div><br></div><div>Flooded Lead Acid is 8-12%, depending on plate sizes and the health of cells. </div><div><br></div><div><br></div><div><div dir="ltr" class="gmail_signature"><table style="width:490px;border-width:1px;margin:0px auto 0px 0px;height:155.5px" border="1"><colgroup><col style="width:123px"><col style="width:366px"></colgroup>
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<p> </p></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 11, 2026 at 8:13 AM Mark Frye via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>
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<p class="MsoNormal">Do AGM discharge 10% a month?<u></u><u></u></p>
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