For years we have been testing homemade ultracapacitor banks in the old cars such as the one on the right. Now commercially available they are a considerable upgrade on original generator powered cars giving you constant power for lamps, quicker charging, easier on the generator, and most of all is not affected from being fully discharged if your car sits around. Due to the power output they are dangerous if you are not careful so do not install one yourself if you are unsure how to do so.