Cherry Mobile announced a while ago that they will be releasing a 6000mAh battery pack for Titan 2.0. As we all know Titan 2.0 is equipped with 300mAh battery and an OTG capability that lets you charge your other gadgets or connect other peripherals such as mouse and keyboard.
Aside from the 6000mAh battery they are also releasing a Back shell to cover up the additional thickness of the battery.
I will update for pricing and availability.
Metro Tech Talk 