I bought an Anker 10-port charger for 4 lights, 1 phone, 2 battery packs, 1 GPS. Two spare ports for future expansion. You never know when electricity will be available, and I want to be able to charge up everything at once as quickly as possible. For example, if I'm having lunch in a town, but won't have power available that night or the next day, I can charge everything for an hour while eating.

A nice, long cord allows me to run a single line to a power outlet outside the tent if power is available at a campsite, and everything stays inside for security and bad weather.