Using a USB voltmeter tester, I found these chargers fit the QuickCharge USB port (orange), one of which was unusual. But make no mistake, 4 out of 5 2.4A (black) USB chargers have fluctuating and inconsistent voltage. The voltmeter reads ranges of 5v4.35v3.33v per second. For further testing, I connected a regular LED strip, and the bulbs flickered. A good USB charger will output a constant 5V and there should be no flickering LEDs. You can test yourself if you don't have a voltmeter. Verdict: Good if you only use fast charging (although a variable output voltage one or two can be quirky), bad if you also want to use a 2.4A USB port. Simply not.
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