>> I'd also like to measure battery voltage to check the >> charge/discharge curves under different operational scenarios.=20 Might something like this do ? www.diodes.com/datasheets/ZXCT1009.pdf I've just bought some from Mouser for PSUs / chargers. A few others in the ZXTC range you might want to look at Joe --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .