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Is it dangerous to use the wrong charger for your battery?
Is it dangerous to jump out of a plane with a backpack full of bricks? Yes. Using the wrong charger can turn your battery into a small homemade grenade. Always use the provided cable or, better yet, a real external charger to avoid ending up in the ER with an "explosive" new look.
A poor charger can deliver unstable voltage or exceed the fatal 4.2V limit. A dedicated charger intelligently manages CC/CV (Constant Current / Constant Voltage) phases and cuts the power once full, protecting your batteries' chemistry.
