I bought Gel battery 12V-90AH BAT412800104 in the end of August. After delivery I checked voltage and it stated 11,76 V. The installation of solar panel delayed, so I checked it once again a week ago and it was 11,5 I decided to charge it. At some point I heard some strange noises from inside of battery. I decided to disconnect it and even after the night I can hear some sounds. The charging took around 2 hours and the voltage is stable 13 V. Charging parameters: 14,4 V max and 3,8 A max. The multimetr showed 13,8 during charging. The battery wasn't even warm. Is it normal or the battery is faulty?
