Not at all health discourse here! 
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I removed my ML1220 and tested this before posting. Machine will not boot until AC powered with the battery removed.
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Looking at my historical CMOS batteries life expectancy with relation to their capacity the FW is using a lot more power. I have a CR2032 (240mAh) from 2009 still doing it’s job…
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Not researched yet either, I based it on npr’s post here.
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I’m not sure. Might have to join other forums for laptops with the ML1220 and ask lol.
I think you are testing your used case and that is a valid test to run! I’m debating running a month long test but I would like to wait for BIOS 3.09 so i can also see how shutdown power usage has improved. I know 3.08 is floating about but I’m unsure what is and isn’t changed in that release.