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Re: Charge Up time
I haven't specifically timed it, but like I said, my observations are on par with what others are reporting on here even with a 2.1A "standard" charger. A couple other things: my battery apps also report estimated charge times similar to the other posters, and I get the same results of charge times and current readings as I do on the stock OEM charger. It's obvious the phone isn't pulling any additional current through that charger.
Originally Posted by Rhyalus
So why would a QC2 charger need a special chip to tell the phone what it is? Even though it's the phone that determines how much current to pull from the charger, the OEM charger is rated at 1.5A, so the phone self limits to that at max. Why HTC made it that way instead of a stronger standard/tablet style charger is anyone's guess, but it is what it is and the phone has to respect that. For The phone to draw more power than the charger can supply would burn out the charger very quickly. So the phone needs a way to determine when a stronger charger is being used. Hence the special chip, circuitry, or whatever QC2 compliant chargers use to "talk" to the phone.
My guess on the reason on all this is due to the myriad of aftermarket chargers out there. Many of them aren't even rated strong enough for the phone as it is. Many people don't know about the requirements, they just see a USB port and think they can plug in and charge anything. So if they allowed those extra high charging rates out of the box, not only would it increase the cost of the phone (due to the included stronger stock charger), but would make most other chargers incompatible and potentially dangerous by being over worked. So the compromise in terms of cost, convenience, and liabilities could be default to a lower charge rate, and only allow the higher rate if a complaint charger is connected so you know it'll be able to handle the task. The USB cable may also need to be compliant, like with heavier gauge power wires to handle the additional current. That's just speculation on my part, though.