Wrong behaviour when battery is depleted

[Tchou]

Hello, here is what i found, 

i forgot to put the crashbar down last time i used the tbm, naturally the battery was dead when i came back the day after. 

But pressing the button to close the rear door still worked and in a strange manner the dor closed instantly and a second press on the close door button would open it up again. 

Here is the video of this from my stream. https://www.twitch.tv/videos/v339829546?t=248s

as the system to close the door is electric, i guess the button shouldn’t have any action in case the battery is out of service.