Heard they fail in high heat, that true?

Oh man, I should clarify! The gravel from the hammer is fine, but you still gotta get the big chunks out. It's more about busting the rock into smaller pieces you can actually remove, not just turning it all to dust. Still saves a ton of time over trying to dig out a whole boulder.

You said you had to scramble to find a shop. But is that really the worst thing? You got to see a bit of the city, right? People plan whole trips to Chiang Mai and you got a free tour looking for an adapter. Missing a deadline is rough, but gear fails for everyone everywhere. Maybe the real problem was not having a backup plan, not the charger dying.