How long should my phone battery last?

I have a HTC one S, not a bad phone, nothing special either though. I use my phone a LOT. Recently I think the battery has started to die. I have only used it for 4 full hours yet my battery is almost dead. Is that normal for a phone to die after being used for 4 hours? I think that's pretty bad but is that... show more I have a HTC one S, not a bad phone, nothing special either though. I use my phone a LOT. Recently I think the battery has started to die. I have only used it for 4 full hours yet my battery is almost dead. Is that normal for a phone to die after being used for 4 hours? I think that's pretty bad but is that normal or is my battery packing up? (i can't buy a new one as it's built into the actual phone) thanks.
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