When the battery is disconnected, any fault codes stored in the engine management ECM memory will be erased. If any faults are suspected, do not disconnect the battery until the fault codes have been read by a Mazda dealer or specialist. If the vehicle is fitted with a code-protected audio unit, refer to the Owners handbook before disconnecting the battery.
The battery is located in the luggage compartment.
Remove the battery cover (where fitted)
Fold back the carpet and lift out the battery cover
Slacken the nut and disconnect the battery negative lead
Disconnect the battery negative lead (arrowed) – early models …
… and later models
Upon reconnection, ensure the battery terminal and lead clamp are clean, then reconnect the negative lead and tighten the retaining nut securely.
Disconnect the battery negative lead as described previously.
Prise up the plastic cover and slacken the nut securing the positive lead to the battery
Lift the plastic cover and slacken the positive clamp nut
Undo the nut or bolt (as applicable) and remove the battery hold-down clamp
Battery hold-down clamp nut (arrowed)
Battery hold-down clamp bolt (arrowed)
Disconnect the vent hose(s) and lift the battery from place. Take care as the battery is heavy!
Refitting is a reversal of removal. Always reconnect the positive lead first, and the negative lead last. Tighten the clamp bolts securely.