Our SUP board rechargeable lithium battery pack doubles the inflation capacity of your Rebel Leisure pump as it can be connected to your pump via the aux/cigarette lighter port with the adapter cable provided.  It's battery power has the same capacity as the SUP pump's built in battery so it doubles the amount of boards you can inflate. This is a great little product (90mm x 65mm x 35mm) which will easily fit into your SUP pump bag.  Comes with an adapter cable and 3 pin mains charger plug.  It will take approximately 2-3 hours to charge to full capacity like your pump. Note: The pump must be left to cool down between board inflations so that it does not overheat.