So far every one of the smallelectric cables I have purchased and worked brilliantly. Pretty sure they are all high speed charging cables (for much less pricewise). At least the ones I have gotten are. I have some that I have had over a year so far. EVERY SO OFTEN we have to reinsert into one of our phones but I think it is the phone, not the cable because it happens just on the one phone. Still, I never get a notice that you can not use this accessory unless the powerbank is almost empty. (make a mental note of this) I think it just doesn't have enough juice to signal that it is usable. I highly recommend and won't buy anything else anymore EVER.
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