Hi, my Audi A5 is equipped with an AGM battery. The battery doesn’t seem to have that much capacity anymore. Now it had to charge more often with my CTek. You shouldn’t use the recond mode with AGM. Battery seems to be an OEM battery (has an Audi part number on it). Some batteries could be filled with distilled water. At AGM I find mixed opinions. With me you can see under the sticker the plugs. So I could theoret until everything is covered with water again. Is there an expert here on the subject?