Olight Universal Charger Repulsed by Battery?!?

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Chronovore
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Olight Universal Charger Repulsed by Battery?!?

So I’ve got the Olight universal charger that attaches to the battery poles by magnets. It has seemed to work well. Then I tried to charge a 21700 and instead of attraction, the magnetic attachment was repulsed by the battery. It would not stick to one of the ends of the battery and could not charge as a result.

The writing on the gray cell says:

NCA 21700T + 3.7V ZS50T - 20.49.1156989

It came with one of my Convoy lights. I never had this happen before. Anyone know what’s up?