Type: BL5335 No. Of cells: 10S Li-Poly Max. efficiency: 86% No load current / 10 V: 2.1 A Current capacity: 78A / 60s Dimensions: 53 x 35 mm Shaft diameter: 8 mm Weight: 668 g/ 23.5oz Recommended model weight: 5 – 10kg Recommended prop without gearbox: 20″ to 22″.