Charging batteries

What is the most important thing that you must not forget to pack before you are going to travel? Besides clothes, I am sure you don't want to forget bringing along a battery charger. It is important these days isn't it? A long time ago, It just happened that I forgot to bring a DSLR battery charger, since that time I always do a double check so I do not to forget to bring a phone charger and battery charger for my DSLR. 

If you are looking for a new charger or battery for your gadget, feel free to click the Battery Heads here link. They have a  lot in their collection and the price is reasonable.