The battery for your roadster is behind the passenger seat. You have to lift the studded carpet. Raise the the wooden access cover to the tool tray. Lift out the the tool tray and the battery is seated below this on the near side. You will also see it by viewing under the near side of the car in line with the back of the seats. I have bought a smart charger and have permanently fitted the connectors, so leave it on trikle charge everyday. This is a cheap and timesaving solution, you will find it is awkward to lift out the battery whilst standing in the car with 1 hand on the tool tray cover and the other to balance.
