External Battery Specs for R2A (NON-Drone)?

what is the specs for an external battery to power the R2A for NON-drone use? THANKS!!!

I use a 5000 4S Gens Ace battery.
The R2A is amazingly power efficient and my chosen battery is TOTAL overkill.
I would suggest a 3000 4S Gens Ace battery.

Gens Ace batteries take fantastic abuse and still keep working.

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The R2A uses about 1000mah per hour of constant run time. You can purchase a battery accordingly with that info.