Good 2-at once charger?

[squeeforever]

Why not just use something like the 989? Yes, you will only be able to charge the same packs at the same time (i.e. you can't charge all 3 at the same time because only 2 are the same kinda pack), but still. Charging 2 then running them why the other is charging is still better than charging one at a time. Not many chargers for a reasonable price have 2 outputs.