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Honda Jazz CVT 05 plate - Flat Battery - windsor lad

Any ideas as what might be causing my battery to go flat if the car is left unused for 3 or more days. It's not the interior light.

Honda Jazz CVT 05 plate - Flat Battery - Avant

Possibly the boot light?

Honda Jazz CVT 05 plate - Flat Battery - elekie&a/c doctor
At 10 years old,it could be the original battery.in which case it is well past its best.get it checked properly.