Best M18 Battery for Quik-Lok Trimmer?

Just got the quik lok trimmer and loving it. Looking into the other attachments and batteries now. New to Milwaukees lawn lineup.

I have 2 acres of land and 20ft x 100ft of small forest behind my yard that I’d like to maintain w this. It came w the M18 8.0 high output battery, what do you recommend as the best battery for these? Saw the weight of the 12.0 forge throws off the balance. Is the difference from the 8.0 Forge and 8.0 ho worth it?