Anyone know about electronics and such?

Here is my query:
On my trip I am bringing a cell phone, a digital camera and an mp3 player. I have a fancy battery charger with AC input that converts to DC and charges 4 nimh batteries ( http://www.semsons.com/pocpowban.html ). There is a USB port on the charger to then charge other devices off of the batteries or directly from the outlet. My mp3 player is no problem since it charges off of a USB cable.

The battery charger came with a USB to DC barrel type wire for charging non USB devices. The voltage is 5V coming out of the charger. The barrel is too big to plug into my cell phone which is 5V, so I am probably going to just splice the tip of the phone's AC adapter to the power circuit on a USB cable or make a simple DC barrel diameter reducer. Thats not really a problem either.

What is a problem is that my camera has a 4.5V proprietary DC input. If I get around the proprietary input and run 5V into the camera will I fry it? Otherwise I will have to carry an external battery charger for the camera along with an extension lead since it doesn't have a folding built in plug and kind of ruins the perfection of my charging setup!