How many bats do you have in rotation? I have 4 in rotation... it only takes about 2 hours to charge a batt, and there's no way in hell anyone could use 3 bats in that time.
As for the multi-slot chargers from totally wicked.. they're designed for 510's. They have adapters for 808's, but you have to buy them individually, and additionally. Plus, it will look pretty awkward.