<div dir="ltr">Even with LFP, mixing different-age batteries is still not the best idea. Even if using closed-loop communication, they can get out of balance pretty quickly, which will lead to all kinds of BMS issues. <br><br>One of the reasons I suggest using a main positive and negative bus with breakers: You can easily isolate the parallel strings and charge them independently to ensure they stay balanced. <br><br>Personally, anything older than six months' difference, I would still plan on balancing every 4-6 months. The harder they work them, the more often they will need to be balanced. <br><br><br><br><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div style="float:left;padding:1px 10px 0 0"><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"></a><a href="http://www.rollsbattery.com" target="_blank"><img src="https://i.imgur.com/YIluKhq.png" alt="" style="padding:3px 0px 0px 10px;float:left;margin-right:10px;width:98px;height:115px"></a><div style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:14px;line-height:20px;font-family:Arial,Helvetica,sans-serif;margin:0px"><font color="#bb1a1d">Steve Higgins ⋅
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<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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