I've got a interesting project aside of my daily dose of work.
I need to set up a 3G mobile phone with camera to stream live video using the 3G network to the web using qik.com.

We need to place this phone in some kind of a water-proof box that is located on a raft. The problem is that there is no power on this raft, so I thought I've use a cars battery to charge the phone through a car mobile charger.

Can anyone calculate how long the battery will last? Using a 12V 60ah battery connected to a ordinary 3G Nokia camera phone.