Just one thing left behind

I have realised that there is only one useful thing I did not took along: the charger for my camera batteries. The optimistic estimation is that the two charged batteries left have enough juice for about 200-300 photos and if I economise later that week, I may extend this to last at least till Sunday afternoon. After this it would be more or less OK to take photos with the phone, unless I can find a new charger from a camera shop here, but on Sunday there will be a nature trip and Saturday I am planning to make a hike. (Where do they sell topographic maps, I wonder?)