harphunt:

You might take a look at the "Ace RC Voltmaster", analog meeter lets you watch whats going on under load and how quick the battery comes back to voltage, 2 loads, 250 and 500 I think, you can check up to a 10 cell pack. Yes, old tec, but very good old tec. Lets you see when your pack is getting tired but will still put out the volts, but for a very short time. ENJOY