Galaxy S6 and S7 have super batteries that can charge quickly as well as wirelessly. Fast wired charging is due to a technology developed by QUALCOMM called as the quick charge. What this essentially does is that the speed of the recharging is greatly enhanced bringing the charging time significantly down.
There are three variants of this quick charge technology is as follows
Quick charge 1.0
Quick charge 2.0
Quick charge 3.0
The 3.0 is the latest one. even though Samsung could have incorporated the quick charge 3.0 in the Galaxy S7 and the S7 edge, it didn’t.
“While Quick Charge 2.0 can charge the smartphone from 0-60 percent in 30 minutes, Quick Charge 3.0 can charge the smartphone from 0-80 percent in 35 minutes, making it almost 38 percent more efficient. This is more important for the Galaxy S7 and Galaxy S7 Edge, which have bigger batteries when compared to last year’s Galaxy S6 and Galaxy S6 Edge.” Brg reported
The reason being that not every Galaxy S7 will use the snapdragon 820. Only the phones in the united states and china get the snapdragon version. The rest of the phone will come with a custom 8890 Exynos processor that is Samsung’s equivalent of Qualcomm’s offering.
The Exynos 7420 used in the Note 5 and the S6 family has the quick charge 2.0 equivalent. But the 8890 has no such tech that could compete with the quick charge 3.0. if Samsung included the quick charge 3.0 in the snapdragon variants, the sale of the 8890 variant Galaxy S7 would be undermined. Hence to maintains some sort of uniformity between all the variants, Samsung has opted to exclude the quick charge 3.0 that could have charged the phone much quicker that previously possible.
The quick charge 3.0 is available in phones such as LG G5, LeEco LeMax Pro. To make up for it, Samsung has incorporated a tech called as wireless fast charging that will quickly charge the phone without any cables attached.