My existing leisure battery will run the TV for about 6 hours and then it all shuts down. Partially, I think it might be past its best because it has clearly completely discharged; and partially, I think maybe 6 hours is about normal. The battery is 13 months old and bought in Germany so any warranty issue is going to be more trouble than it's worth. So, my question - Might it be a good idea to put another leisure battery alongside it and if I do how complicated is it to couple them up. If it is anything more complicated than unclamping the connections and putting two extra cables across then I best leave it to the experts to fix. All help very much appreciated. One more point, I read somewhere that leisure batteries and engine batteries are different - Is that a big deal or a red herring?