Lance, Well, now you've started another sub-thread :) > primary cells like alkaline or lithium ( lithium iron disulphide!...not > lithium manganese dioxide which are only good for low current > applications ). The lithium/manganese dioxide batteries I've used have pretty low internal resistance- the DL123A (duracell camera battery) is rated for over one amp. continuous. Is that low current? OK, you MIGHT need more than one amp to shock those grad students in the psych studies. :) Is it true that Lithium/Iron Disulphide batteries are very expensive per W-hour compared with others? Thanks, Barry. ------------ Barry King, KA1NLH NRG Systems "Measuring the Wind's Energy" http://www.nrgsystems.com Check out the accumulated (PIC) wisdom of the ages at: PIC/PICList FAQ: http://www.piclist.org -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu