Flat Battery

I do not know if other owners encounter such a situation, and that the "reset" when I can get to have the vehicle towed to the shop.
I have a 2010 DBS Volante (manual Carbon Edition) ... On his journey back to six weeks, I went to start the car and the laptop external battery charger is empty (somehow came out of the charger output). During the charging process, and check the battery, I noticed, had a short battery cells, so I replaced. But the car is not the ECU. Tension is good, interior lights, headlights and all reagents locks (as a whole), but it is usually not the answer at the beginning of the ECU on the entertainment system or any other system related to the function original. In fact, with the exception of other functional objects, everything else is "dead" (power windows, pwr top, soft-start, Nav, radio, error messages, etc.
I checked all the fuses are blown (chassis, engine and battery fuse) and fuses are in good condition.
In the upper left corner of the indicator light in the instrument cluster flashes red LED whichdenotes disorder, so I guess the problem is the immobilizer, which causes avoidable. how to increase laptop battery life？
If I understand correctly, the safety function of the drain voltage (stick) to disable non-core activities such as the drain voltage. But no one knows what will happen when the voltage reaches 10.5 and below are some of the "RESET" how to "erase" any disorder.
I understand that the alarm is only a special batteries, which may need to be replaced, but I would say a few years of universal external laptop battery on board could have, they are not interchangeable (one for changing the module itself themselves) ..
I'd be interested to hear if anyone has seen ... and, perhaps, if there is a solution or addition to the steps required to take ...