Make sure you are powered up with the YN-B1800 Rechargeable Li-Ion Battery from Yongnuo. Use this a spare or replacement cell for the one included with your YN860Li speedlight. Featuring a 1800mAh capacity and output voltage of 11.1V, this battery can power your flash for up to 700 full-power pops and enables recycle times of approximately 1.5 seconds.

Yongnuo YN-B1800 Specs;