Oper8 8.4v 1600 mah crane stock battery - Mini Tamiya 

Ideal for crane stocks and handguards, especially when the conventional mini type is a bit of a pain when trying to fit it. With crane stock batteries you have the option of splitting the cells and tucking them into the sides of handguards and making use of the space.

Made up of 2/3A 1.2v cells (x7) 
Connector: Mini Tamiya (16 G wire)
Weight 164g