charging a123 question..

[t-maxxracer32]

hey i bought a 3s1p kit awhile ago on a123 racing and if i went and bought dual 5s1p packs and wired them up in parallel can i charge both at the sametime? i dont think you could because you need to plug the balancer into the charger... but maybe there is a way to connect both batteries onto one balancer wire cable thing?

what would the runtime be for a revo (8xl mm esc) for a 4600 5sa123 setup?

thanks!