How long should iphone 3gs battery life last?

My one only lasts about 3.6 hours constant on 3G is this normal?
I bought it of ebay, should i send it back?

You should get through most of the day unless you are a heavy user. 3.6 hours is definitely not normal.

No, that's pretty normal. I have the same phone and it's annoying constantly having to charge it haha but yeah mine lasts for about the same amount of time. Turning off Wi-Fi, location services, closing apps and turning down the brightness helps to save the battery for longer as well. It also depends on how much you're using the phone.

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