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Rejuvenating Dry SLA batteries

I had some dead 12v 12Ah batteries from an APC smart ups 1000 that were quite old (md 2009) and very dry. I have replaced them with a set of new 18Ah batteries. I thought I would try my hand at getting these old batteries going again. One battery was showing ~12 volts...

4 – 20mA Current Loop

Above Circuit http://tinyurl.com/y5kgx3af With ADC/DAC http://tinyurl.com/y3pbmyzl Analogue Input Digital Output via 4 bit ADC/DAC https://www.instrumentationtoolbox.com/2012/03/basics-of-4-20ma-current-loop.html...

4 Way Board

Board https://www.sparkydirect.com.au/p/30298/nls-18-pole-surface-mount-ip54-rated-distribution.html RCD/MCB HAGER ADA910T2 POLE 10AMP 6KA 30MA RCD/MCB COMBO...

LY2 Relays

JQX-13F 012-2Z1(555) https://www.futurlec.com/Relays/GR12V10ABLpr.shtml https://www.hongfa.com/product/detail/8689630f-1b45-4525-bb90-e4187635236f JQX-13F-2ZDownload JQX-13FDownload...