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Conservation of energy, basically it's not that it wouldn't work "at all" or appear to anyway but that it wouldn't work as desired. You can't recapture the power used to propel the bike because it's being used to propel the bike. Adding a collector increases the power needed to turn the wheels and basically makes the drive battery's job harder, so it runs less efficiently and runs out faster, battery 2 does charge and can be run from, but in the end you end up with less range due to the stacking inefficiency and energy leakage. The closest functional system to what they are talking about would be a breaking system like electric cars use.