01 Fiat Ducato Battery drained

Hi, hope somebody can help on this one. My 01 Ducato was left sitting up for the last two weeks. When I went to start it yesterday, it would not start and I had to jump it to get it going. There is a new battery fitted so did not think that it would drain that quickly. I have found that there is not much space for getting the jump leads in to the battery!

Only thing that I can think of is that the cigarette lighter, radio and reversing camera screen seem to be permanently live; i.e. radio has to be turned off after switching off key, camera screen is always on standby and cig. lighter will work without key. Would the combination of the three of these things be enough to drain the battery?

There is an isolator switch/key on the battery which I have now removed until I need to start the van again which I hope will keep the battery from draining. I presume it is possible and not a major job to change the three of these to work with the key only?

Thanks in advance.

If it is what is actually causing the battery to drain, then I probably would change it back and fit a separate radio back in the living area. This is what I had done in my previous camper (self build). I found that I did not listen to the radio much when in the van though (only when driving) so it's not a priority for me I suppose.

Thanks Dan. The leisure battery is new as well and it was not drained at the time.

I can't remember the make of radio, it's an aftermarket type I'd imagine and is not a common brand as I would remember the make if it was. There is a pilot light constantly on in the camera monitor so there is obviously current being drawn from there. I will try to change it over next chance I get and report back. I'm busy for next few days so won't get near it to take a look.