?Natsemi makes / made a venerable SLA charging IC. Part number escapes me. Gargoyle and Digikey probably advise with correct serach. Has a good block diagram and discussion in the data sheet. Easily enough emulated in software and does most of what you want, probably. numerous lead acid charger ICs on Digikey http://search.digikey.com/scripts/DkSearch/dksus.dll?Selection R > I've been looking around for a sealed lead charger. A piece of > equipment I'm building has to be run off a battery, 6V or 12V, > and I prefer to use an SLA. The PIC which runs the equipment > is available as a charge monitor, as the equipment will not be > run when the battery is under charge -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist