The SuperPack™ 8507 is a 7.4 volt  Li-Poly battery. It's rated at 850 mAh and delivers 18C continuous power. It weighs only 47 grams fully charged. It comes with  JST and balance connectors installed. The balance connector lead is long enough to make it easy to charge the battery under any circumstances. 

This battery is a real powerhouse and it's ideal for advanced pilots and aggressive flying, when you want your heli as light as possible.  Beginners should be careful when ordering this battery. Its light weight and high power may make it hard for new pilots to control their helicopter's altitude. Flight times are around 15 minutes, depending on the condition of your helicopter.

SP8507 fits the Walkera Dragonfly 4, EF Sabre, Venom Night Ranger2, Esky Honeybee2 FP, Dynam Hughes 300 FP and Phoenix FP, Exceed Falcon 40 and similar micro helicopters that use a standard 8.4v NiMH battery pack.  

(67mm x 35mm x 9.6mm)  (2.64" x 1.38" x .38")