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I've posted this in another thread, but it's the same idea. If you MUST recharge the battery on the go instead of like tjts1 suggests doing, belt the alternator to a driveshaft and only energize the coils with the brake lights. That's REAL regen braking. You'd only be charging when you're trying to stop when you're trying to bleed off energy anyway and you could still put in a switch to kick it in full time if the battery got too low. The only problem I see is possiby the speed the driveshafts turning could be a lot different than the engine, but that just requires a different sized pulley on the alternator.
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