From: muratlanne@gmail.com   
      
   "Neon John"  wrote in message   
   news:0l5a4e19ji1pdf9q5bj5ofrfothdr3f662@4ax.com...   
   > On Thu, 3 Jan 2019 09:14:42 -0500, "Jim Wilkins"   
   >  wrote:   
   >   
   >>Have you needed to replace AGMs yet? My experience with 12V18Ah AGMs   
   >>is that they deteriorate after around 5 years and can't be restored,   
   >>while flooded batteries are useable for at least 10 years if kept   
   >>charged.   
   >   
   > All my life I've had a reliable supply of telephone station   
   > batteries.   
   > I'd get them about the specified 10 year replacement and I'd get   
   > about   
   > 10 years' more use.   
   >   
   > With AGMs, the station change out is about 20 years and then I get   
   > another 20 years out of them.   
   >   
   > I have about 10 years into my current set of whole-house AGMs after   
   > their 20 years in the switch.  I have a friend down from Nu Yawk   
   > Citi   
   > and one of out projects is to see what these have left using a   
   > commercial battery tester.  I expect these to go the full 40 years   
   > again.   
   >   
   > John   
   > John DeArmond   
   > http://www.neon-john.com   
   > http://www.tnduction.com   
   > Tellico Plains, Occupied TN   
   > See website for email address   
   >   
      
   What does your commercial battery tester measure?   
      
   My experience is with industrial battery testers designed in-house,   
   mostly for Lithiums. They performed a time-consuming full discharge   
   and recharge cycle that recalibrates the battery pack's internal fuel   
   gauge. I haven't seen convincing evidence that the quicker DC or AC   
   impedance testers for lead-acids correlate well with remaining   
   capacity or service life.   
   -jsw   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)