The Galaxy S9 has a smaller battery than the S9+ (3,000mAh to 3,500mAh), but so far it hasn't shown all that much of a difference as we've tested the two devices. Both devices streamed our sample YouTube video for about 10 hours before giving out, which is a very good result. Both devices leaked approximately one percent of battery per hour over the course of two days in standby mode.
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