As others have said, the energy that a supercapacitor can store is practically nothing compared to lipo. And that is by weight, when supercapacitors are less de

As others have said, the energy that a supercapacitor can store is practically nothing compared to lipo. And that is by weight, when supercapacitors are less dense then lipo. If you want more power you can just put more batteries in parallel. Or use batteries with lower resistance (the flat ones). As for gathering bursts of energy; Again the problem is energy capacity. The (potential) energy released by braking really hard is really high (per time). You could use a flywheel battery for that. They can take it. They are even used in roller coasters just for that purpose (granted they use big flywheels). Considering people usually break "softly", it is just not worth it.