
2022-04-24 (or rather, early morning 2022-04-25)

For measuing short-circuit current, a crude 4-wire connection was made to the tested battery (where battery means the full 11 9V batteries in series): 
   a x10 HF probe (Keysight N2862B, 10:1 passive 150 MHz 10 Mohm 300V rms) to oscilloscope Ch1 connected with croc-clip around the - terminal and a copper wire directly across the + terminals of the battery; 
   and battery clips connected another pair of wires, one of which went through a hall-effect current probe (Fluke , set to 100 mV/A) to oscillosope Ch2.  

The scope (Agilent DSO-X 2014A) was set to single trigger when the voltage fell from its ~10V (i.e. 11 * 9V / 10) to near zero. 

Stored files were in the scope's 'csv' format: csv for the data, and separate txt for settings. 
Files numbered 0-5 were from the lithium batteries, and 6-9 [sic: but we don't have 9.. thinking in 1-based numbering...?] were from the alkaline.  

The two wires from the terminals were simply shorted together by pushing banana-plug onto clip side. The intention was for a couple of seconds then release, to see the dynamics of short-circuit current and recovering open-circuit voltage. 
Repeats were needed as there wasn't a single case of a really clean "connect, stay, disconnect" - it ended up with some little breaks of continuity, at least with the lithium batteries.  
To do this properly, a transistor would be a good choice. 

Interestingly, the lithium didn't give significantly different short-circuit current level compared to the alkaline.   This is despite the very clear differences of the two tested battery types in EIS, particularly at lower frequencies.  
Both species became noticeably slightly warm from their efforts. 





