I've noticed this over the years. I'll get a brand new USB cable and measure it as charging my Galaxy S5 at a rate of 1500 mA. Over a year or so the same cable, on the same phone, on the same charger, on the same operating system, will only be able to put out 500 mA or so. Doesn't repeated bending …

Why do USB cables lose the ability to charge quickly over time?

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