We only have a battery pack to jump start the van if the battery dies. It also has USB plug-ins for our phone, but for some reason the newer Surface Pro's can't charge via USB, I need to have a standard electrical outlet. My problem yesterday, was I could never find a spot that has both electricity AND Wi-Fi. And my Surface is so old that the battery only lasts for a random number of minutes between 10 and 30, so it's very unreliable for mobile work. My girlfriend and I tend to be very resourceful... :)