Did you take your digital camera with you? And the charger? You can try to fassion an improvized arrangement to charge your phone battery. All you need is two wires (you can use rolled-up aluminium foil, e.g. from chocolate) and an elastic band or two to keep them in place. Just watch the polarity!

I charged my camera's battery that way twice with my other half's charger when I forgot to pack mine.