The Galaxy Note 9’s standout feature is its 4,000mAh battery. It ran out our 12-hour battery test video we stream over Wi-Fi with 15 percent of juice remaining, projecting screen-on battery life out to 14 hours. That beats every other flagship smartphone we’ve tested. The battery is significantly larger than the one in the Galaxy S9+ (3,500mAh, 10+ hours), the Galaxy Note 8 (3,300mAh, 6 hours), or the Galaxy Note 5 (3,020mAh, 8 hours and 30 minutes).
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