I recently shut my Sp3 down for several days ( I first switched both Bluetooth and WiFi off and then hit Power button - Shutdown) But before I did that I charged the battery to 100%. When I switched the device on several days later the charge state was still at 100%. However if I shut it down with Bluetooth and WiFi still on then it does loose some charge whilst in the shut down state. I guess that even though it is shut down the fact that the wireless adapter is still switched on that adapter is consuming some power. But I am not an expert in this so I do not know. I can only relate what happens in my situation. For others it may be different.