This is the perfect companion for what I suggested on day two. The Newmowa battery charger, when coupled with the Anker portable charger would be a welcome gift for every photographer i have ever met...
Here are some links for common batteries from Canon, Nikon, Fuji and Sony... So grab a battery of yours and do some research on which to purchase... you will not regret this purchase when coupled with day #2's Item.
Newmowa Dual USB Charger for Canon DSLR Batteries http://a.co/fkGqjqR
Newmowa Dual USB Charger for Nikon DSLR Batteries http://a.co/6qOJ0tl
Newmowa Dual USB Charger for Fuji Mirrorless Batteries http://a.co/eGasWXa
Newmowa Dual USB Charger for Sony Mirrorless Batteries http://a.co/0aiFD7m
Day #2's gift suggestion can be found by clicking here