Yea, 14.3 sounds reasonable. Honestly, I had not made that decision yet. I have been concentrating on getting the circuit running, knowing that value is easy enough to change once the hardware is in place. I started typing a long explanation here and referred to the gassing voltage charge here
https://www.powerstream.com/SLA.htm but then when I started considering common temperature situations for my climate and when I would most likely be using it.............., I ended up around 14.5 volts as a reasonable compromise.
I had to do some reasoning and reading to come up with what you already knew....;-)
The charger charges at the full capabilities of the charger transformer and battery till about 10 volts, as measured, then drops to about 20% charge rate till 14.5 volts is detected, then stops charging. It monitors the voltage and will start charging again, should the voltage drop. Although, if my final voltage is going to be around 14.5 volts, then 80% would be more like 11.6 volts so that may be my value to switch to a lower charge rate. The 10 volts I think was just a number I grabbed for the test bench.
Well, as I said earlier in this thread, this adventure was more about learning about these chargers and charging L/A batteries, doing a microcontroller project and the associated programmming, etc. than about saving an old dumb charger and I think that mission is going well. I still have to move the cct to an actual battery and see how it goes,,,
. Then install it in the old battery charger case etc. I guess I might as well make a few cct boards since I have a few dumb chargers that could benefit from this upgrade.
Thanks again.