Internet Communications While At Sea?
100 minutes is longer than you may think.
Compose everything offline and minimize the size of any images.
If you limit your online time to simply uploading/sending all your pre-created content and try to limit your online time to 2 minutes each session, you could get away with it.
It's simply a case of getting all your ducks in a row.
Aside from that, there's a chance of bartering with other shipmates for online time.
What To Do With All of My Gadget Chargers?
If your worried about where to plug your *ahem* gadgets, I'd say that's the least of your worries.
Perhaps you need to step outside into that room with the big light, get a bit of exercise, read a book, have sex, go for drinks with friends, go on holiday, live a little.
Perhaps ask yourself "Why do I have so many gadgets? What would happen if I got rid of some of them? What is regular sex like?"