Recharge mobile phones on board

This summer, It's decided, We rent a large catamaran in family ! Finally, would be better to say "in extended family. : four adults, two older teens + their respective boyfriend-girlfriend + a child of 11 years ago. It has thought of everything : journey, victualling, clothing, Sun creams, sunglasses, caps, masks and snorkels, fishing lines… about ! A week before our departure, the skipper has whispered :

-You thought to charge phones ?
There, a silence, then the response :
-UH, isn't it, what for ?
-You will be new on board, It's been so many smartphones and certainly half of tablets… and there are only two plugs cigarette lighter on the boat !
-Damn…

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