Anyone know about the battery life of the Samsung Galaxy S3?

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Can anyone tell me about how long the battery last? I use Twitter and the Internet 24/7 on my Samsung Epic and even without using it it'll die within about 5-7 hours and with use around 4-5. Around the time I get my S3 (April 1st) I will be going on my senior trip and its basically a full day plus a few hours and we won't be near chargers but I am looking into buying a portable phone charger but I still would like to know how long the battery would last because I won't be able to use the charger the hold time nor want to because it probably won't last that long. Any help?
Thanks in advance!