Design a mechanical Battery Switch for multi Battery E Bike

Job ID: 34360890

Budget: $250 – $750 USD

I need to hire a mechanical engineer to build me three proto type e bike switches to switch between 2 to 3 batteries and use either a nob switch or bottom . Which will lock the other batteries out when one is swutched on . Once one is depleted rider can switch to new battery . I need this done right away .