Originally Posted by indymx
I can't be 100% sure why it happened, but 2 cables from the same manufacturer did the same thing.
The odd thing was, they looked like they were charging. All indications were that they were connected and electrons flowed, but the battery level dropped while connected.
That is odd. I just tried what I had around, and a Samsung cable, and 3rd party one (branded Boxwave, but probably a pretty generic retractable type) both seem to work just fine for charging when connected to the HTC charger "block".
YMMV, indeed. To answer the OP, there isn't a good way of knowing whether a 3rd party cable will work or not without trying it. A genuine HTC cable is the sure bet, but since the OP wants something longer, he will have to look elsewhere. And 3rd party cables are much cheaper, of course.
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Phone: AT&T HTC One (M8)
Tablet: Samsung Galaxy Tab Pro 8.4 (WiFi only)