If the cells are completely flat, leave the PL-P switched "OFF" over night, with the CCC-3 charger connecter and turned "ON". During this period the trickle charge current, 50-100mA, will bring the batteries to a state where the risk of reverse polarization will not occur.
In NagraNews 17, January 1999 " Periodically, about once a month, it is a good idea to completely discharge the internal batteries, until the PL-P stops automatically. Then return the input selector and connect the charger unit to reinitialize a charge cycle."
If PL-P OFF and CCC-3 disconnected, discharge current is - 2mA . INTERNAL BATTERY WILL BE TOTALLY FLAT AFTER 2-3 MONTHS.
If PL-P OFF and CCC-3 connected but in OFF MODE, discharge current is -10 mA, INTERNAL BATTERY WILL BE TOTALLY FLAT AFTER 15-20 days.
If PL-P ON and charger disconnected or OFF, discharge current is - 2.3 A, internal battery will discharge and the PL-P will automatically stop when 10% of the capacity remains. Approximately 1.5 hours.
If PL-P ON and charger connected and switched ON, internal battery receives trickle charge current, and will remain ON permanently.
Charger CCC3 connected and switched ON : switching the PL-P from ON to OFF begins initialization of the charge routine. 0.4 to 0.6 A for 12 hours. After 12 hours the trickle charge current is supplied ."