Hello, I have been having the problem for a long time that the battery is not properly charged by my scooter. I have to charge the battery every week with my charger, because the voltage drops to just under 12V after a week. But the whole thing only happens when you drive. If the scooter stands for 2 months, the voltage drops from 12.8V to approximately 12.4V. Today I also noticed that the battery is thick in one place. Is this normal? Can I continue with it? The battery is t by the way 2 years old. Can it only be due to the battery or is it also possible that the alternator is defective?