Probably old news but I see in their latest monthly flier two new battery chargers:
They look interesting and I would probably get one if I didn't already have a similar CTEK Charger. The Maintenance mode isn't explained for either one. You would have to play with one to find out what it does while analyzing the output. I looked at all the comments and didn't find anything there either. They claim to have a reconditioning mode for desulphating, but how it does this isn't explained...
Currently there is a $39.99 coupon for the larger version #63299. Code
29790926 thru 10-31-2017.