I got an Oscilloscope!

[What's_nitro?]

FireWire79-

You just need some power resistors (or 200' of solid 10awg copper wire) for your dummy load. 100A is a TON of power though. At 6s it's over 2100 watts if the cells hold 3.5V/cell!! If you were doing momentary testing (<3 seconds on, 5% duty cycle, fan cooled), I guess a power rating of 500W on the resistors would be OK. At 21V, a 0.21 ohm resistor is needed. To make things easier, look for 0.2 ohm - 0.25 ohm. A 0.25 ohm is around 90A current. It isn't difficult to build, but the resistors are going to be EXPENSIVE to say the least.

Edit- Wow! I just did an eBay search and found this! Man this would be PERFECT for that dummy load!!! not a bad starting price either!