<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Larry,</div><div>I've never had a pack that actually had the voltage rising above charged 4.2v per cell.</div><div><br></div><div>Is he telling you voltage increases if the pack was stored in lipo charge bag, fully charged?</div><div><br></div><div>Not something that I am aware of using lipo for past 9 years.</div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">Sent from my Samsung Galaxy Note® II</div></div><br><br><br>-------- Original message --------<br>From: Larry Diamond <ldiamond@diamondrc.com> <br>Date: 05/16/2013 11:57 AM (GMT-06:00) <br>To: General pattern discussion <nsrca-discussion@lists.nsrca.org> <br>Subject: [NSRCA-discussion] LiPo Storage Voltage Question <br> <br><br><div style="color:#000; background-color:#fff; font-family:times new roman, new york, times, serif;font-size:12pt"><div style="RIGHT: auto">A few days ago this was a topic dicussed at length about LiPo charging and storage practice.</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">I learned a bit and thanks to all the posts sheading light on the topic...</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">One question that I asked my local battery guy rewarded me with a response I didn't expect. Has anybody else observed this?</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Here is his claim/actual observation:</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto"><strong style="RIGHT: auto"><em style="RIGHT: auto"><u style="RIGHT: auto">"If a LiPo is stored after a peak charge the voltage may tend to rise over time to as much as 5.0V+ for a single cell."</u></em></strong></div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">After the discussion topic on here and discussing the issue with my battery guy, I have came to the conclusion that storing a LiPo battery is much safer at a lower voltage state (~3.9V/Cell) to prevent an inadvertant puff due to an unstable cell(s) climbing voltage over time. I recall the discussion about an unstable pack, but I don't recall any mention of the voltage climbing. Perhaps I missed it and it seems worth revisiting anyway.<var id="yui-ie-cursor"></var></div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Basically any LiPo battery stored over a 2 week period should be charged/discharged to a storage voltage or a nominal 3.9v/cell. Storage voltage opinons vary from 50%+ (~3.9v/cell+)</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Internet references show 50% charge = nominal 3.85V/cell)</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Additional thoughts on the peaked battery increasing in voltage over a longer period of time...???????????</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">I just bought six new 5s-LiPo Packs and I'm new to this stuff... So what say you experienced folks?</div>
<div style="RIGHT: auto"> </div>
<div style="RIGHT: auto">Larry Diamond</div>
<div style="RIGHT: auto"> </div></div></body>