Charge time was calculated by looking at the video and noting the time when the always-on-display of the Galaxy S9 would register 100%.A time-lapse video was recorded of each charging session using a Wyze Cam, with a photo captured every 60 seconds.After four minutes, the phone was powered on and unlocked. The phone was placed on a wireless charging pad, and a timer was set for four minutes (the minimum time required to bring the phone back to life across all the pads we tested).If not, we used Samsung’s standard wall adapter and an appropriate cable. If a wireless charger included its own power supply, we used it.
To completely drain the battery on the Galaxy S9, we looped a movie in VLC with screen brightness set to 100 percent until the phone powered off.We enabled airplane mode on the Galaxy S9 to prevent notifications or connections from impacting battery life throughout each test.
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