how to improve electric bicycle..??

Electric bicycle are use 12/24v battery and brush less dc motor so we know that if we are mechanical used in this bicycles to charged battery ( convert mechanical energy to electrical energy )  there is normally way to every bicycles manufacturer facilities providing but if you have to improve your bicycles you have to used solar plate 12 volt , don't worry Small plate are available and you put on front Head light above in your bicycles and parallel connection in your changing connection and you used your bicycle double power boost you normally speed so your battery faster charged.