For deep cycling I levae the battery in the inspire until it shuts down by itself. Then I charge the battery with the slow charger (100w). Then fly that battery till 10-15% and again leave in the inspire until it shuts down by itself. It usually takes about 10-15 min for shutdown from 10% battery level. On the next (the third one) charge and flight I have great flying time. Unfortunatelly for very old and heavy used batteries this will not help much but overal is the best reviving practice I've found.