Please look at our size chart, you can find this by scrolling to the 3rd image posted to find your approximate size.

Battery not included.

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