Hey guys, my cranking battery has died and the reason why is because my car can sit for a month or two between proper drives, the battery charge level goes up and down and has not really been looked after properly.

Before I get a new battery I want to get a proper battery charger to leave plugged in all the time so it will last a few years more. That's the confusing part.

The ctek website recommends at least a 7A charger for a battery of 120Ah, but I'm sure I've read people using much smaller chargers without a problem. I was looking at their 3.6A one which they say will do up to 75Ah, is that just marketing bull crap to make you buy the dearer one?