First, it assumes that one is willingly upgrading to Catalina from Mojave.
(One has to be a glutton for punishment to sink into the Catalina pit.)
Second, there is coconutBattery, which provides not just the current state of charge in mAh, but most importantly the depleted full state of charge relative to the designed battery capacity, reported in both mAh and percentage. Something that Apple refuses to do.
So, hard no -- my own opinion.
have fun on your outdated os then
EDIT: Wrote this comment in a bad moment...unnecessary...sorry..
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