Coolant and oil are not "flammable liquids" - their flash point temperature is (considerably) above normal ambient temperature. (Translation: the vapor in the vicinity of the liquid won't ignite - because there is so little of it that it can't.) They are combustible liquids - they will burn under the right conditions (basically, in an already-burning fire, or when atomized in air and exposed to a flame). Coolant is only combustible with difficulty since it's mixed with water.
Building codes and fire codes are mostly concerned about "flammable liquids" - which are essentially liquids that are capable of having ignitable vapors at normal ambient temperature. The gasoline is the one you have to concern yourself with.
It is a possibility to take the battery out and store it separately - but make sure nothing electrically conductive can ever come in contact with the battery terminals. A charged 9 volt battery carelessly tossed in the trash can easily start a fire if its terminals both touch something conductive (e.g. aluminum foil or other metal objects) and there is paper in contact with that. Personally, I think the safest place for the battery is in the bike's own battery enclosure but with the negative terminal disconnected and insulated to prevent accidental contact.
Your insurance company, and your city bylaws, may have their own ideas about what is allowed and what isn't.
