First, fully drain the robot's batteries by running the unit in the pool until it dies.
Then, charge the robot before storing according to the chart below:
For example, if you would like to store your unit from August until the end of May, or 9 months, you would charge it for 2.5 hours before storing.
If you are storing your unit for over 9 months, charge for 2 hours every 6 months.
Store in a warm dry indoor shelter during off seasons - do NOT store your unit outdoors.
Do NOT leave your unit plugged into the charger while storing.