Since they are not disimilar to camera batteries, mobile phone batteries, laptop batteries, etc, etc, you should have no problems. Lithium Ion and Lipo's are close in construction.
Lithium polymer is not classed as a wet battery...that is reserved for lead acid style batteries where there is a true liquid electrolyte...lipo's have a gel electrolyte in them.
That's my understanding anyway, not tried travelling with them myself...but I wouldn't have thought it'd be a problem.
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