The Nissan Dualis battery replacement isn’t a saga—more a quick pit stop with spanners. You’ll want a 12 V battery suited to your trim (standard flooded lead‑acid is common; models with idle‑stop need AGM/EFB), and around town a mobile fitter will do it while you finish your coffee.
Save your radio presets: keep doors shut, then remove the negative (-) terminal first, the positive second; swap the battery; refit positive, then negative, and clamp it firmly so it doesn’t jiggle like a jelly at a picnic. After starting, reset the clock/windows, and check the charging voltage sits about 13.8–14.6 V.
In Australia, expect roughly $200–$350 for a quality lead‑acid, or $300–$500 for AGM/EFB, plus $40–$100 if someone else does the spannering. If that sounds like a lot, consider the alternative: calling roadside assist in the rain.
Consult official documentation for exact figures.

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