leisure battery only provides 12 volt power so unless you have and inverter contacted up. It's not going to work. Even if had without a way of recharging the battery the inverter alone would soon get though the battery.
Portable battery banks like an ecoflo will power 240 v stuff as they have inbuilt inverter and 3 pin plug outlets. But you'd need to check if the Ninja Foodi will work at a lower wattage. As most battery banks have a max wattage out put.
With no hook your best option is using some sort of gas cooking option. eg camping stove or campinggaz party grill.
What options do you currently have for electrical power and do you have anyway of recharging/ topping them up without EHU ?
The small Ninja Foodi 6-in-1 is rated as 1460W as in it will drain the battery pack even quicker.
As already suggested, use gas to cook if EHU is not available.
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