There will be two Aviation connectors that come with Zero-Breeze which allow you to connect a DIY power cord to the device along with your battery pack.
Zero Breeze unboxing tutorial
If I don't purchase the additional battery, will the unit still be able to operate independently without being "plugged in"?
No, you won't be able to run Zero-Breeze without being "plugged in" if you don't purchase the additional battery.
Yes, ZeroBreeze can be used in cabin. Unit can either run from vehicle’s power source(require 12V, 15A) or from its own battery.
Its 120-150 Watt.
3.5 to 5 hours
No, ZeroBreeze will not release any gases.
Zero Breeze is capable of cooling a 50 square feet room down to 44 ℉
Make sure the power system can supply stable 12V, 15A DC power, ZeroBreeze will work.
No water or ice is needed, ZeroBreeze is a compressor air conditioner.
Life span of ZeroBreeze is designed to have 5-6 years.