There's one other thing to be watchful for with the Cellpro-10 charger. If you are charching two packs at a time, and you mix up the two center power leads, you will blow a component inside the charger. If this happens you will still be able to charge a single pack, but two packs will no longer charge.

This has happened to me twice so far, and each time I had to send the charger back FMA for repairs. Each time I did it I kicked myself for being so stupid, but it's easy to do, especially if you're rushed and you aren't aware of this failure mode.