I was thinking of building a acid lead battery charger for my car battery(12V, 48Ah). Of course I will use AVR uC(probably 4433). It's still a concept but I need some suggestion from someone who actually built one. The dilemma is wheater to use a simple constant current source(with bjt and resistor) and monitoring circuit or to use a switcher(step up) like in Atmel'a app note 450(I think).It need to be robust, reliable and universal. With one switch one could select appropriate charging current(10% of battery's capacity) so that a charger could be used to charge batteries with different capacity as well.
I've browsed the forum looking for some solutions but came up with nothing.
Could anyone provide a good link to some battery theory sites? I'm interesting in a design ideas and designs that work. AVR software is not my primary concern.A good and robust charger circuit that works well
is more important.