In Reply to: charging circuit for yuasa np 4-6 lead acid posted by Duncan Parker on 09/11/00 at 2:32 PM:
I have just noticed your query and by this time you may already have a solution.
However, just in case you don't, I would like to know what the voltage and AH capacity of the Yuasa LA batteries which you are using (I don't have a Yuasa catalog), and whether there is great need for a fast charge time frame or not. I assume that the batteries are a gelled-electrolyte type and not like a conventional auto version.
In passing, I have had good results in charging the gelled-electrolyte type using a "constant-voltage" charging method with peak current limiting and temperature compensation (the colder the ambient temperature the higher the charging voltage must be --the reverse when the temperature goes up.)
I have many suitable circuits in my files including one which is "constant current" until a pre-set terminal voltage is reached whereupon the circuit switches to a "constant voltage", but this is not suitable for just any battery, which is why I am querying the Yuasa specs.
If you are still "with me" and still require some assistance please indicate same as a reply to the Community Website which I shall monitor for possible further action.
In the meantime, etc.
Brian Snell (email@example.com)