Set of 2 High Quality 3.7V 300mAh batteries. 

Works for many different toys and drones, as well as the Sky Runner - NX1700, NX1710 or 1710-NX. 

1 battery is 1 3/8"L x 7/8"W x 1/4"H. The wires/ leads are about 1 1/2" long. 

35mm L x 20mm W x 5mm H. The wires/leads are about 34mm long.

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