Thanks Uniserver.  Great detail.  Well, a massive Duracell lantern battery is way too large. I don't want a boat anchor connected to my CC or my buddies 575.  Maybe a compromise is three C cells, or three AA cells. I can not see enough detail in the chart you posted (I can't tell the difference between a , and a .)

Any chance you could email me that photo?

I guess the resistance of 20 ohms or 43 ohms is a non issue?

I sure like the idea of moving the PRAM battery to the back, outside of the computers with velcro.

jack

jack