Restoring Laptop To Factory Settings?

I bought a HP Laptop and am unsatisfied with the battery Life. Under the terms of the retailer, I will not be able to return the laptop if it has been 'used'. The only thing I have done is turn the machine on and set up the user account for first use e.g "Mary" and browse a few websites. Is it possible to restore the laptop to the factory settings as I received it, meaning that if the retailer turns on the laptop he/she will be asked to set up a Windows 7 user account for the laptop and also things such as HP user/laptop registration will be prompted again etc? (So that they get the impression that the laptop has not even been used? The retailers are a major PC and Laptop selling company, would they be able to know if the laptop had been set up and used?

There exists a partition in the hard drive solely for recovery purposes. Providing that the retailer will think that the laptop has never been used, and will be asked to set up a new windows account and asked welcome to your new windows laptop (or whatever that comes up) and the bloatware that comes with the HP laptop is all there, how would I go about restoring it to that 'new laptop' setting?