Turn off your chargers
Modern chargers use electronics to change the 230V AC into 5V for our devices.
Leaving them plugged in and turned on while not in use simply wears out the components, which can have a 1000- or 2000-hour rating.
They are also a leading cause of fire in New Zealand, so do yourself a favour and switch them off when not in use. It won’t save much electricity but it may save wearing the charger out or prevent a fire.