I’m not certain about the wattage. However, when I plug in my phone, it displays around 6-7 watts. I believe the cable that came with the speaker was recommended, but will using a charger with a higher wattage harm the speaker?
Using 5 or 7 watt charger with my Soundcore 3. Will it be harmful for the speaker?
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No it will not harm your speaker. Controller inside speaker will take as much as required to charge speaker.
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The inbuilt electronic controller checks if the speaker is full charged and takes only the power from the charger which is needed.
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As long as it’s a USB Power Brick you will be fine as the other’s have mentioned.