you can make a adapter with a servo extension plug to hookup charger thru mains .bottom plug with deans is what I used to charge a single cell on a lipo pack with a low cell you can make up similar plug to charge thru balance wire
you could just plug it into the charger... since you have a nice lipo charger.. list what exact cell you have ? along with that nice charger more than likely you will need to make a cell holder with main power leads along with a balance plug very few chargers will charge directly thru balance...