Quote by Tee
The charger unit is a Maypole MP7428 and it is now showing an error light.
https://www.screwfix.com/p/may…C%20MP7428
Very unusual it is not what you would expect as this is simply a car charger and not really what I would expect to find.
The battery charging is usually carried out by the Control unit which show the battery charge system ., contols lights etc mounted on the wall somewhere.
I doubt that the Maypole can cope with multiply batteries at the same time like the much more expensive fitted type.
You would be better trying to find out what is the matter with that, looking for a replecement (Try E-Bay a few used on there) or maybe someone on here knows someone who could check it out for you.
The Maypole may not be able to cope with a totally flat battery dont know but can suggest that you look at this one which can
if you are looking for another just to charge a battery, again however will do one at a time
https://www.ebay.co.uk/itm/8A-…CLK%7Cclp%
David