A drone LiPo battery protector for those smaller ~55mm long 850mAh batteries and smaller 16mm wide battery straps also available in ~76mm long for 1300-1500mAh batteries and standard 20mm wide battery straps 
A balance lead connector hole is provided in the rear of the sled to keep your balance leads away from your props.
The 30° launch angle gives you instant forward acceleration off the line so you always get the holeshot.