here are several BUT none of them use a PIC micro or PBP...


http://www.repeater-builder.com/backup-power/pdfs/automatic-sealed-bat-chrgr.pdf

http://adventure-radio.org/ars/pages...ext/N7CEE.html

http://www.batteryspace.com/leadacid...sfloating.aspx

http://www.theheathkitshop.com/page4/page4.html