Hi, I am sorry to hear about your S8+ not having as much power. Can't figure out why your battery is always draining? Your phone has the answer. You can monitor and extend its battery life or use a Power saving mode to get the most out of it. You'll never be stumped about your phone's battery life again. Try these options: https://www.samsung.com/us/support/answer/ANS00078987/
Please let me know if this helps.
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