7 days x 24 hrs/day = 168 hrs. If something is drawing 250mA, thats 42Ah. Depending on the size of the battery, that could be a significant portion of the rated capacity and cause it to discharge to the point where your car won't start. The Lilliput probably isn't completely off. I thought I saw something here that said at least some of the Lilliputs drew more the 250mA when "off". Do a search on the forum and you should find more information.
Kind of off topic, but I have an old army surplus vehicle with a switch that disconnects everything from the battery. It will start after 2 or 3 months of sitting. None of my more recent Toyotas would do that with nothing but the stock equipment in them. Alarm systems and keyless entry systems all take current so you've got to use your vehicles reasonably often or you drain the battery. And that seems to be really hard on the batteries too.
It's impossible for us to speculate as to what the problem is. Your best bet would be to install a current meter inline with your battery (with the car off) and see what kind of load you are drawing at idle (make sure all dome lights are off).
The generally acceptable amount of idle current is <50mA, but I generally like to see less then 35mA.
If you are over 50mA start uplugging aftermarket stuff first. If you still have a high load you can start pulling fuses, one at a time, until you find the fuse that disconnects the load.
I've read about OEM stereos in certain cars having internal issues that keep them powered up, killing the battery rather quickly.
I have a lilliput and what you describe is not off. It is standby. Standby means that it will auto-on, but also means you have to drive the car every 3 or 4 days or you are doomed.
I leave mine on all the time. When I go on vacation, I pop the hood and disconnect the negative terminal of the battery. Come back, screw it back on, starts right up.
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Alright so in the morning today I measured a whopping 500ma, then took lilliput and put it on ignition fuse and it dropped to 89ma, howver if my PC is in S3 mode overnight my load is 193ma, which is not 2 bad i presume. but with everythhing off I still for some reason get 89ma.