Good day i have a battery bank of 3 - 12 volts in parrallel total of 450amp (gel batteries) that i am trying to figure if they are still good : they were at 11.8 volts when i connected my charger (victron ip22 12-30Amp and a few seconds after i connected the charger it switches to absorption despites the voltage is still low on the batteries.Is it a sign that these batteries are turning bad ? thanks