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Qi versus wired charging - S5 results
I used the Galaxy Charging Current app to look at my S5 with the OEM charging cover. Charging current average is 1200 mA wired, 640mA on Qi with the "lilysagu" tilt chargers we use at home and work, and with the Sammy OEM Qi charger.
Operating status conditions of the S5 were the same for both - basically I measured the charging current on the Qi stand, then unplugged the power supply from the stand and plugged the power cord directly into the S5.
My wife's S5 uses the "fone salesman SlimPWRcard" add-on receiver, and her charging current with that receiver is about the same as my Sammy OEM Qi back. To make a direct comparison would require that I set both S5s to be running exactly the same apps, network, etc. and frankly that's more trouble than it's worth considering the small difference in measured current between the two.
So it appears that Qi charging takes about twice as long as wired charging. For my wife and me (we both have an S5) that's not an issue since the S5 battery life is more than adequate for all day use so we just drop the units on the charging stands when we go to bed. We love Qi charging - I'm posting this for the heavy users, for whom faster charging may be important.
Edit: I received the suggestion to measure the charging current using the OEM power supply and that charges the S5 at 1800mA. Qi charging is about three times slower than that.