I've been given a 12v battery charger that doesn't have a cutoff on the boost mode, so there is a risk of boiling the battery if it gets left on. I was wondering if this would be very difficult or expensive to set up? I'd assume that it would be current dependent as a voltmeter would be testing the charge voltage as opposed to the battery voltage.
I'm an industrially trained sparkie with little to no experience with electronics (apart from replacing blown components on PCBs)