RE: Voltmeter for A123 cells
The only downside (if you want to call it that) is that the pocketloader does not balance charge. Granted, while the A123's are NOT balance "critical" like lipos, it can afford you up to a few extra hunder Mah if they are out of balance. If you don't have another balancing charger, you may want to look at something like a blinky-balancer or other similar product. Just make sure it is A123 compatible.
Enjoy those batteries, there's nothing better out (right now).