Which resistor to build 6V photo lithium tester?

Hello, and Happy New Year to everybody.

My battery tester uses a (too weak) 10mA load for its 6V test.

I'm guessing that a 2CR5 Photo Lithium battery should be tested at

Any electronics geniuses out there? What type/size resistor should I connect to the battery, while testing with my battery meter, to simulate a Canon SLR's load, and provide me with an estimation of the usability of my 2CR5 (and other 6V lithium) batteries? I also have a DMM.

Thanks for all advise and tips.