two usb-c ports, both will charge, both can be used to charge other device. I haven't done it extensively, but it will support additional QHD resolution dispaly if it mattered...
has a SIM card slot
I honestly don't know about the battery, I use it mostly around my home, I use it for watching movies and youtube around kitchen - It can do two movies definitely - 3-4 hours screaming at full blast - more - i'd have to try. But i recall that when I got it I was impressed by its battery life. I have the 10IGL5 version. The CPU has 6W TDP.
I don't expect that you would be using the included keyboard very much - way too flimsy for your application - but I can imagine suitable rugged bluetooth or wired keyboard / mouse combo would do ...
There are no "holes" on the device used for heat exchange and there is (AFAIK - haven't opened it) any fan. There are some holes for speaker on top left & right corner, but if those get cloged can't be critical. The whole chasis is sturdy you can press on it hard and it doesn't give, it can resist a bit of twisting but yeah - it's an Ideapad - not a Thinkpad w/ magnesium rollcage. It definitely doesn't mind being splashed with liquids around kitchen.
I am a hardcore thinkpad / debian / xfce aficionado, I wouldn't go and search for a device like this myself. A colleague of mine was trying to get rid of his, he bought it for his kid but running windows 10 the thing was bloody useless. I've googled somewhere that it does linux good and after limited success with Ubuntu i've tried Fedora. I recall trying a touch interface with linux long time ago (around 1st iPads) and it was a laughably misserable experience. This was amazing - IMO deffinitely better than what windows had to offer even though I understand the bar is low here. Better interface, at least as reliable (more). I've bought it off my colleague for cca 200 USD / 5000 CZK. I can imagine I would be confident enough bringing it with me on a holiday instead of full 14" thinkpad for mobility & battery life.