I don't think you really have much to worry about.
Put it in airplane mode and turn off the screen.
The battery lasts 2 months reading 30 minutes a day.
How often do you need to charge it when you use it everyday?
It won't drain that much. I charge my K5 about every 6 months and that is a way older device. Even then it isn't empty.
Seriously, if you are that worried either leave it on a charger or put it in your luggage.
So where are you going that you will be busy 24/7?
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