What charger do you own ?

Different chargers approach storage mode differently

The aim is to get the pack to around 50% or 3.85v / cell, anywhere between 3.7 and 3.9 will be fine

Some chargers will only discharge from a higher voltage 'down' to storage voltage (Discharge rate will be limited to the discharge rating of the charger, small 50 watt chargers usually rate limit the discharge rate to 5 watts or so)

Usually discharge does not include balancing

Some chargers will only charge 'up' to storage voltage using the normal settings for charging, may include balancing

Some chargers will automatically charge or discharge based on voltage

Cheers