Jump Start A Car Using A Portable Jump Starter Technically Works The Exact Same Way As Booster Cables Except That The Device Itself Is The Source Of Power, Rather Than Another Car With A Charged Battery. Portable Jump Starter Works, It Really Helps When You On Side Of The Road Or At The Shopping Mall And when Your Car Battery Is Dead. Not Only Its Charges Your Car Battery, Also Your Phone, Laptop, Etc. It’s A Great Emergency Tool To Have In Your Car, Alone With An Emergency Small Tool Kit. IT’S A MUST HAVE TOOL If You Own Any Automotive Vehicle.