I managed to fix my battery charger by attaching new crocodile clips, wrapping the ends with insulating tape, and I installed new fuses.
Got the DART to Dún Laoghaire, and charged the battery in my boat.

Battery on boat
My voltmeter is not accurate enough to give a precise voltage reading, but I charged the battery for two hours today.
This is the first time that I had the battery out of its holder, so I checked the labels.
The description is:
UNIPART SAMSON Heavy Duty Battery
Heavy Duty Type 678 12 Volts
Keep Upright
Check Polarity Before Fitting
Leisure 75
Recharge after use.”
I know that it is 12 volts and 75 amps, and it is a marine battery. But what else can I find out?
The closest description that I could find on the Web is the “Leisure Unipart Samson Battery 678″:
Battery with integrated carry handle, Magic Eye feature and Kamina lid vent.
208mm (l) x 175mm (h) x 255mm (h)
Weight: 16.2Kg
Reserve capacity:100 minutes
Cold start: 480 amp
But is this the same battery?

Leisure Unipart Samson Battery 678