I have had to make a few more Zener- resistor balance circuits as some were not evenly matched and caused 2 batteries to discharge below 13.2 at rest. They should be 13.6v (2x6.8V)
The Zener diode voltages would seem to be too low. I need to fix my adjustable PSU and measure the reverse knee voltage on them to verify the voltage and match them in sets of 4 for charging.
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