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I went to Nepal two years ago to hike to Everest Base Camp, and had the same concerns as you. I flew with Singapore Airlines and I got them to give me the OK for a couple of 30000mah/111wh "veektomx" power banks from Amazon (which are very good). They didn't seem to have any issues at all. Based on the airline's info, restrictions were based on watt-hours rather than milli-amp hours. At the time, you could have 2 rechargeable batteries of between 100wh - 160wh per person.
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