Ctek chargers, such as the one you mention (MX 5.0), have: 'maintenance pulse charging (Float/Pulse) - Once the battery is fully charged, the charger switches to a pulse mode. It allows the battery to drain slightly and then sends a pulse of charge to keep it at optimum levels.'
In short, this means these 'smarter' modern chargers are designed to be 'connect and forget' over longer periods of time because they are not charging constantly and allow the battery to drop and then charge it back to 95-100%, before starting the process again.
MMC used to supply Banner battery chargers but I am not sure if that relationship is still in place and I couldn't see them showing on the list of Banner OE companies.
Like Luddite, I use the MX 5.0 and have found them to be excellent.
I use a CTEK, and it's permanently connected when the car is not in use. The MMC service team recommended this and also said that the CTEK is their preferred charger.
