1:Battery not included
2:We are Asian size, 2-3 sizes smaller than European size, please choose the right size according to our size chart。
3:Recommend batteries model, please use batteries with high USB Power Delivery(unit:W), The higher the USB Power Delivery, the higher the heating temperature.(output Power (W)=Voltage (V) × Current (A).)
for example :output power 10W=5V*2A / output power 22.5W=5V*4.5A
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