This was a summary from another long discussion on Electric karts, by power train specialist ...
Quote: "25 Lbs of the best Lithium batteries would give you just enough power for about 5 minutes of TAG performance level racing at 80% discharge.
Battery recharging would overwhelm the typical power at a track so you'll need to add a generator to the cost. And don't plan on any more then 8% energy recovery from a retard braking system unless you want to add cost (and mass) for a clutch operated secondary planetary gearing system.
As far as cost goes batteries will need to drop to about 1/2-1/3 their current cost to be competitive with current technology." END Quote.
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