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I'm pretty sure the alarm on a watch wouldn't wake me up if I'm sleeping good. I use my iPhone in airplane mode.
I just bought a Suunto Core, it's pretty sweet. My buddy wore one last fall and it was plenty loud enough to wake me up, not really a light sleeper. He snore pretty darn loud and it woke him up. I used my phone last fall in airplane mode, lasted about 5 days with pictures and all. Then I was screwed.
Just a thought, but there are some rechargable battery packs and/or ones that run off of AAs to recharge phones that may be lighter than a solar charger. I'm thinking of taking something like this along:5 Days is pretty good. I have a Brunton solar charger that will give it a full charge so that should get me through a week easy.