Hello to everyone, this is my first post. Excuse me if I am in the wrong category. Now to my problem: My car battery is empty again. Since the car is not to be used for a little longer, I wanted to charge the battery at my home (Exide 71Ah) with the Einhell CE-BC 4M. If I connect the charger and choose the program 12V hours then I have only 2 bars and the charger shows me only 13,1V. According to my research this is probably too little This was confirmed last night, because I had the battery charged for 10 hours and then found that nothing was happening. I connected the charger to another battery to check it (Exide 95Ah, AGM). According to the charger it is full and the charger shows me 14V or more. My question: How do they get the “empty” battery charged?. I still have a start-up cable lying around with me. Is it possible to charge the two batteries with to connect each other so that the full battery can charge the empty battery?. – If so, how do I have to connect the two batteries – is it enough to connect only the plus poles?. I thank you in advance