When staying at pilgrim refuges/alberbergs with multiple people in one room, i am wondering how one charges up mobile phone? I imagine there a limited power points, so one needs to be fair sharing what i imagine is a scarce resource. or are many power points provided? should i bring a power board with multi plugs so fair to all? but wt and space issue. i have a booster charger, but still needs powerpoint. looked into solar chargers and they dont seem that very efficient or effective whilst walking with a backpack. naturally not wanting to use ph great deal, but using camino app with offline maps and would like to be contactable as dad not that healthy. thanks in anticipation, kerrie