Hey guys, im headin down to my not so local hobby shop tomarrow, to get my new emaxx as a late b-day present

i know about the dual batteries, but dont like the charging.one of my friends used to have a venom charger, the $150 one whatever its called, and he used some kind of harness to charge 2 batteries at once. my question is, all i have is a megatech charger,nothing fancy, can i make such a harness for it to charge 2?or is it just the charger?im gonna buy a new charger soon, like the onyx 240, but it doesnt charge lipos, which i have

so until than, im wondering about this.thanks guys
THE CAT