<div dir="auto">I had the same experience as Jay as far as being marketed three idea that managed lithium batteries can jane several year age differences and still play well together, only to be told, after telling my clients the same, that most manufacturers don't recommend more than a year age differential (although apparently a few say mix and match till your heart's content). They also recommend keeping them in open loop, I think mostly because of all the firmware updating that is happening on both the battery and inverter side which causes continual incompatibility issues.  Disappointing, to say the least. <div dir="auto"><br><div dir="auto">Fortunately, I have yet to see any Fortress BMS failures.</div><div dir="auto"><br></div><div dir="auto">Howie</div><div dir="auto">Sun Catcher </div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 23, 2024, 10:37 PM Darryl Thayer 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 class="gmail_default" style="font-family:times new roman,serif;font-size:large">If the batteries have a 10-year life, I don't think it would make much difference. LA batteries show an increase in internal resistance after a few recharges. Typically, the BMS in a Li battery will ensure at top balance all cells balance,  If the batteries are being properly recharged.   </div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Apr 23, 2024 at 4:05 PM jay 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">HI All<br>
<br>
Speaking of batteries  I wonder what you all make of this.<br>
<br>
I was reading the Fortress battery manual and it says they don’t recommend adding new lithium batteries to older lithium batteries if the age is over 1 year difference.<br>
<br>
Thoughts?<br>
<br>
thanks<br>
jay<br>
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