fireman7875, with a screen name like that, you might want to educate yourself on the special handling required for LiPoly batteries, and the risks involved with their mistreatment.

If you need to charge multiple batteries, buy additional chargers. That's how we do it. Why don't they make dual-output chargers? Expense. A dual output version of the chargers currently on the market would cost nearly twice as much as the single-output version. Would you really pay $250 for a dual-output Astro 109? Not many people would, and the point is to sell large quantities of chargers to make money. If you're not going to sell large quantities of chargers, why make them?