On Tue, Nov 2, 2010 at 4:48 PM, Stephen R Phillips wrote: > Depends on the battery type. With a primary cell you dissipate some of th= e energy in the cell as well. =A0Lithium thionylchloride batteries for exam= ple do not like it one bit. However the standard CR2032 is manganese dioxid= e instead so its internal impedance isn't as severely impaired by large cur= rent draws. > > I suggest you ignore TI's claims. The main reason why is you should alway= s go by the battery manufacturers specs. Since you cannot test the batterie= s without discharging them and possibly damaging them in the process you ca= nnot test and sort for which battery will fail. Bottom line is the batterie= s are made to a spec and the manufacturer can change the battery beneath th= at spec any time as long as it meets the spec. This happens with rechargeab= le lithium ion batteries all the time. Although less likely with a lithium = primary cell it's a possibility and your design may not work any longer. > > Stephen What spec are you referring to? I don't recall seeing max current spec'ed by any coin cell manufacturer. Note that even the cheapy no-name cells were not harmed by the 30 mA peak current, at least at room temperature. Regards, Mark markrages@gmail --=20 Mark Rages, Engineer Midwest Telecine LLC markrages@midwesttelecine.com --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .