White/Silver does not have a removable battery, and there is not an external Refuel battery pack for this model as of yet. You could hook up a jump pack, however; your camera will not charge while it's recording- which kind of makes attaching a jump pack directly into it. I've learned that your recharge time from the jump pack could be rather slow as well. You're better off plugging it in directly to a power plug to recharge it. This is what I have discovered with my use.
I would recommend buying the Hero 7 Black. It has a removable battery and you could buy a spare to swap out your used battery while it charges.