How much power should my portable charger have?

"How much power a portable charger should have depends on what device it should charge. In general it can be said that to charge a smartphone or Mp3 player you need 2200-4000mAh, for tablets 5000-8000mAh and for laptops 10400-12000mAh."

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大蔵　信夫 31-07-2025
ANKER A1271
I don't know how to turn on and off the power saving mode. No matter what I do with the blue lamp, it won't turn green.

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