@Pat Spencer ,
Usually there is a label on the underside of the laptop that has the model number/serial number information on it.
It can also be found on the box that the laptop came in.
Here are some examples of where it is and what it can look like
[image|2057644]
(click on image to enlarge for better viewing)
Also as it is only eleven months old, you do not want to go opening the laptop to get to the battery etc, as you may void the ''manufacturer's warranty'' by doing so.
Contact the HP customer service centre in your location and ask for help or make a claim for a ''manufacturer's warranty'' repair.
That's what warranties are for.