Re: Customer service?
I don't know how it is in the UK, but the vast majority of car batteries here in the states can still be topped up, and that includes most of the batteries installed in brand new cars. They call them maintenance-free, but you can (and should) pop the cap off (there are two of them, having three cells each) and check the electrolyte level periodically despite the name. Some batteries are truly sealed, like AC Delco batteries, but most are not.