Big Squid Lipo-shootout 2

So it sounds like you just need to figure out a way to use the energy, that does not produce heat. What about making a alternator based machine. Take a belt and a car alternator, then mod a belt roller with a spur gear. You could then add some sort of brake system to simulate higher loads. Great thing about this is you could then charge a battery, to run your chargers off of, to charge your batteries your testing.