Don't know if this will help as mine is a different PCB, but where I have marked with a circle traces to where the positive of the battery goes. Looks like the third lug in from the edge on yours is the same connection ...
PRS-1H ST-1 JTL-1 - G.O.T.M July 2019 LPM-1E - G.O.T.M March 2020 Scratch Body Experiments StrazzV Gumtree Score
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