Another Flat Battery

After the RAC man on the journey home who gave me a jump start told me the battery was from a Nissan Micra, first job was to fit a new battery. I did this and it's been handy, given the car's propensity to splutter to a halt when trying to pull away on occasion.

Was going to go out in the car, but battery was flat - put it on charge but when I connected it all up there was a big power drain - about 4/5 amps at least. Eventually traced to the driver's door electric window switch which was jammed on.