electrical - How can I figure out cordless drill terminal polarities? - Home Improvement Stack Exchange

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I just got this Black and Decker SS18 drill and wanted to run it with my existing batteries but the drill has no polarity markings. Anyway to figure out which terminal is which?

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20V Brushless Electric Drill, 45NM Outdoor Cordless Power Tool, Home Repair DIY Multitool by PROSTORMER (2 Li-Ion Batteries)

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electrical - How can I figure out cordless drill terminal polarities? - Home Improvement Stack Exchange

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The PROSTORMER brushless cordless screwdriver/drill is a handy compact tool for home improvement and DIY. Whether you're a professional craftsman in

20V Brushless Electric Drill, 45NM Outdoor Cordless Power Tool, Home Repair DIY Multitool by PROSTORMER (2 Li-Ion Batteries)