On Wed, Jun 20, 2012 at 3:59 PM, David VanHorn wrote: > I'm wondering if anyone out there could point me to a source for > 2032-ish sized LI coin cells with max discharge currents up in about > 50-60mA range, and internal impedance down in the 1 ohm neighborhood. > Somewhat thicker is ok, diameter is somewhat non-critical but the > application requires this general form factor. 123A cells would be > ideal except for totally not making the mechanicals work. > > Like Unicorns, I don't think they exist, but if they do I'm sure > someone here has seen them. > > What are the other requirements? Do they have to be in a circular form factor? What about square li-ion polymer packs? Those have very good discharge characteristics. How big is the device itself? Is the pulse current predictable? If so, even though making use of a super capacitor is probably a bad idea (because of leaking what little energy the small battery has in the first place), you might be able to use an intelligent mechanism with a small super capacitor to charge when you know a pulse is needed, and turn off charging the super capacitor when not needed if practical. How many batteries can you stick in the device? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .