Can a new lithium ion battery work in this unit, when time to replace?  Is Li battery an option?  Does the product require a specific size battery or can any battery that fits work in the generator?  My application is for powering the electronics inside a small camper and as a backup for weather emergencies in my residence.   Thanks for your assistance.

Happy Camper, Tim

Nice product, like the scalability and portability, and all the features.  Might be just right for my application.