hello, I did some looking for you and found this article which describes exactly what to do, also a useful link, hope this helped you have a great day
Typically, Honda seats have a bolt at the rear and one on either side. Remove the bolts, the seat comes off easily. This process is described in your owner manual which should be in its space behind one of the side covers. In that same space, you should find a tool kit with the tools required to remove the seat. You might want to check out this site ...
http://hrca.honda.com/publications/. Some Honda batteries come out the side. Some other Honda motorcycles have a seat which unlocks and opens up in a similar fashion to a glove box in a car. The battery is easily accessible in this style. I don't think yours is this style, still this is good information to have.