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Sep 10, 2019 at 22:20 comment added Mark Flipping the battery in your photo is safe, because the battery case is designed to prevent electrical contact if the polarity is reversed (note the raised plastic around one end of the bridge). In battery cases without this protection, flipping a battery can cause the other batteries to try to charge the flipped one, with potentially catastrophic results.
Sep 9, 2019 at 23:06 history answered glen_geek CC BY-SA 4.0