For many years I have had a CTEK MXS 5.0 – just like probably half of those present. For years I have been charging my cars’ batteries sporadically (and prophylactically) at times (*) because I don’t drive that much. (*) From time to time = every three to four months. Now I have two cars for one or two years, which do themselves independently when charging: after twelve hours not even the fifth LED – only overnight – lights up after over 24 hours. anden – lights up the green LED. The two cars affected are a Porsche 911 and a Range Rover – both with AGM batteries. As I said, both vehicles (and their batteries) are almost new. With my good, old Land Rover Defender, however, the recharging only takes 3-4 hours. And this also has an AGM battery – with similar capacity as the above two problem vehicles. 24 hours charging can not be, can it? The batteries are not empty. The cars bring n not even a warning message that the battery is weak. And at some point the CTEK also indicates charged: after 24 hours. Powers after Adam Riese >100 Ah, which are impossible to miss. Any idea?