IPhone 4S dying at 5 percent?

It used to die after 1% like Noam but lately it's been at 5%. I use it a lot.

Try letting the battery drain once in a while to give it better life or restoring it

The percentage is just an estimate. But to improve battery life you have to turn off bluetooth, location settings, dim the brightness. Things like that will help. Again, the percentage is only an estimate.

There's a thing called battery memory. If you charge your phone before its dead it'll shorten the battery life, same goes if you unplug it before its fully charged.

I used to have the same problem, but it was dying around 30%. I took my 4S to an apple store about a month ago and they just gave me a new one, for free.