So I wonder if I can still save the battery so far to be able to use it as an emergency reserve for start-up aid, 12V source in the basement. 2 years old Varta E39 Silver dynamic 70Ah, side small openings to the gas, under the sticker are the well-known locking plugs to recognize 1 year ago it was 2 times deep discharge on 12 V by defect/defect current in the car. After that inconspicuously. From autumn I noticed that the charging condition became worse, the battery took more and more unwillingly the charge and stopped it less. Feel-good window at 67% charge condition. Charger said full at 82-85% charge level. However, with charge over 8 hours it was 100% full. Now on 100% charged, then waste over 24h to 12.02V. After further night (10h) 11,61V. This is the actual condition. Car has already got new battery bought. I would instead of the recond mode, should not be used at AGM actually, decide to a normal charging process, but then with maintenance charge I don’t have to give it to myself. I wouldn’t do it in the basement, but I don’t like it in front of the front door or on the terrace. Can that get on fire? It takes too long to monitor it nonstop, I want to sleep… Opinions? Ben