From: w.newell@tx.rr.com   
      
   On Thu, 09 Jan 2020 08:43:21 +0000, DecadentLinuxUserNumeroUno wrote:   
      
   >  Are there any LiFePo battery UPS systems yet?  Sure would be   
   > lighter and have a longer lifespan between 'storage unit' replacements.   
   > (single 'cells' or the entire battery)   
      
   you can always replace the lead acid batteries with whatever you want as   
   long as the voltages match up. And yes there are 12V lifepo4 batteries   
   that can be a direct replacement for the LA batteries, but thye aren't   
   cheap. I made up a 10ah 20C lico/lipo 7s battery out of 5 year old lipo   
   cells a few years ago and ran them in my 24V source 750va ups for several   
   years before they finally lost most of their capacity. Most of the cells I   
   used had been depuffed by me before assembling them, But they worked fine   
   until they lost their capacity. The ups kept them charged at no more than   
   28.1V (~4V per cell). The biggest problem is the cost for new ones   
   compared to LA batteries. This was documented here.   
   https://endless-sphere.com/forums/viewtopic.php?   
   f=14&t=82386&p=1243983&hilit=ups#p1209606   
      
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