Whole pack never when under 48. Charger would come on run the cycle. The incomplete light would come on and that was it. The charger on light would not come on. Open the charger up, took the board out. Checked it all. Did not see anything burnt. Put back together. Charged my batteries with my 24 volt charger. ( batteries 6 8 volt ) Did 3 and 3. Today I have 50 volts. Just plugged the charger in. Ran it’s cycles clicked and came on.