.: Unobtainium (looses a proton)-> Readiliobtainium Readiliobtainium (looses a proton)-> Notsorarium Notsorarium (looses a proton)-> Aprilfoolarium Tom Abbott (inventor of the Calculagraph) coined the phrase "Time is Money", see: http://www.prc68.com/I/Calculagraph.shtml Have Fun, Brooke Clarke http://www.PRC68.com Tom Holmes, N8ZM wrote: > Brilliant!

I have seen some RTC’s that won’t last a month on a coin cell. My recollection is that the Oncore backup is closer to that category than the “many years on a cap” group.

. > > > On Mon, Apr 25, 2016 at 2:11 AM, Joseph Gray wrote: >> Can anyone recommend a rechargeable lithium coin cell that is a direct >> replacement for the ones that come on some Oncore receivers?

As it turns out, even gold coin has two sides to it. I have found that Shlepnev and McMorrow conducted extensive research and published data, some of which is presented here http://www.simberian.com/Presentations/NickelCharacterizationPresentation_emc2011.pdf In essence, it's not the "G" that is the problem - it is the "N".

. > >> Both of these have 3 battery packs made of some form of coin cell, NiCd, > >> 225ma, 5 to a stack. > > > > These are what I'm familiar with (I presume you mean 4 packs, not > > 3?). 

An even better way was to use a Mercury coin cell since they were 1.35 volts and very stable. They were used for light meters and voltage references because of the very flat discharge curve. But when you are looking for many more digits of accuracy/precision then a battery may not be the best choice since pretty much everything will cause a variation.

>From Steve Spector, Milford, Silver Sands SP,  10/3/15, Orange-crwoned Warbler (near Nettleton Pond); Bobolink (old service road).  Very birdy this AM. charsjs@sbcglobal.net

The chip itself is 52 mils by 42 mils or comparable to a thermocouple bead. I figured out that two of them can be driven back to back by a square wave and two temperatures monitored at once with the same pair of wires. An Analog Devices product engineer split a $100 prize with me for my invention.

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