battery draining power

[carterleeds]

hi guys wondering if you could help.

if i leave the cars for about 2 days my battery drains, and i dont know why

the battery is brand new and right for the car, i have coded the battery in using vcds.

checked connections to the battery eveyrthing seems fine.

nothing seems on when the car is locked.

could it be the battery control ecu/unit thats gone bad?

thanks in advanced