The charge lasts a week, so if you know you're going to be completely away from technology, charge before you go. But then again, there's a car charger and there are portable chargers. I find the fact that it's a USB charger to be very convenient. I can plug it into other pieces of technology (laptops, ipads, etc.) and steal their power to charge up the pump.
It really has not proven to be a challenge. Not any worse than if you got a low battery alert while in the woods and didn't have any AAA batteries with you.
I will say, however, that was the biggest caution the Minimed rep gave me when I told them I was switching. I'm glad I gave it a chance. They really went with the scare tactic there.