7.4V 1800mAh Li-ion Battery (XT60)

This is a standard replacement power source for many of Heng Long's remote-controlled models, particularly their 1/16 scale RC tanks with the latest control systems (like the TK 7.0/7.1 versions). The battery is typically a black, rectangular pack made of two 18650-sized Li-ion cells bundled together, with the characteristic yellow XT60 connector plug attached to the main power lead.