what about li-ions they are lipos with a harder case aren't they?
as for co2 how many hits from bots like inertia and drumroll could a.fire extinguisher take we all saw raizer blade explode when its gas tank was punctured. it exploded
little hitter would turn a paintball bottle into a collinder
I am very inexperienced but I.see.no.reason why a well protected robot with loads of armour andna.fireproof box won't do the job
sorry for all the full.stops.