Great ! I finally achieved to use it. Thanks a lot Marcus.

Okay, it's Bruno again. I still need your help (and really feel like a jerk ...) : I've changed the cell, set the date and hour and followed the instructions to set intervelometer ... but still don't see how this function works. Here is what I did : 1/ in "Intvl" I set the time lapse (eg 2")...

I finally found the battery ! Great ! Thanks a lot you guys : a description, a picture and even a notice ! Big up to Swedish photographers !! I owe you a beer, next time you come to Paris ...

Thanks a lot Anton for your quick answer ... but my problem is that I don't see any small battery inside the grip when I pull it out of the camera nor any place to put it. I guess it must be somewhere since something is diplayed on the LCD screen but I can't find it. Is there something to unscrew ?

@Marcus Larsson Hi Marcus, I write you from France and used Google translate to understand your discussion since I don't speak Swedish. I've been offered a used EOS 550D equipped with the grip Meike 550-DL. Unfortunaltely, there was no manual included for the grip. When I introduce the 2...