Bring a Wireless Phone Charger
One thing I wasn't expecting to find on the trail was regular outlets. In the first few tea houses we stayed in, they had power outlets that accepted American chargers — no adapter needed. But the higher up you go, the more basic things become, and a lot of rooms stop having outlets. Because you'll want to keep your phone charged for photos, bring a portable charger. I used this Anker PowerCore Power Bank ($50), and it worked perfectly.