Moin, my car was moved very little mostly only with short distances. Yesterday it can not start because the battery is empty. When voltage measurement shows the multimeter 9.6V I then took out the battery and connected it in the apartment to a charger (a very cheap one from Absaar). Although the battery is detected and charged, after c.a 1 hour shows however the charger that the battery is defective and the charging process has been stopped Have read in the network that a battery This seems to help, charging takes much longer this time, the charging current increases continuously(14,4V) and battery capacity also (according to the charger 80% charged). However, after 10 hours of charging time, the charger shows again that the battery is defective. The battery has only 10.7V again. What can this be? Can I still save the battery? Maybe with a higher value, the battery can be used to save the battery. to the charger of CTEK try greetings