dakhath
Active member
Take a moment and read this article about how the S4 varies its pull of electricity dependent on what it needs. I had linked it in an earlier post and it is where I pulled the quote in red from.
There is more information I did not mention.
AnandTech | Samsung Galaxy S 4 Review - Part 1
Another piece of that review:
Samsung uses a voltage divider and signals the presence of their own charger by sending 1.2-1.3 V across the D+ / D- pins, this is similar to what Apple does with 2.0 or 2.8 V across the pins for various USB chargers they've shipped over the years. This signaling is essentially Samsung's proprietary tablet charging signaling which they've employed on the Galaxy Note 2 and now SGS4, in fact the two use the same exact charger, so it's worth tossing out your old ones and getting the appropriate one to take advantage of the faster charging.
There is more information I did not mention.
AnandTech | Samsung Galaxy S 4 Review - Part 1
Another piece of that review:
Samsung uses a voltage divider and signals the presence of their own charger by sending 1.2-1.3 V across the D+ / D- pins, this is similar to what Apple does with 2.0 or 2.8 V across the pins for various USB chargers they've shipped over the years. This signaling is essentially Samsung's proprietary tablet charging signaling which they've employed on the Galaxy Note 2 and now SGS4, in fact the two use the same exact charger, so it's worth tossing out your old ones and getting the appropriate one to take advantage of the faster charging.