SS,
The charger needs to be plugged into the mains and connected to the battery for it to work.
The charger is converting mains alternating current - AC - into direct current - DC - which is what your car uses.
If you have a laptop, the 'chocolate box' in the mains lead is doing the same thing.
The Halfords charger looks OK, but everyone seems to speak well of the CTEK in the other link, which is neater and a bit cheaper.
You may have seen car starters, which tend to be a big, yellow plastic box with a moulded handle.
They are basically a battery which you charge in the house and then attach to your car to 'jump' start it.
I would be wary of using that type of appliance because it punches out a lot of current.
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