In use, I have the external power now since about 3 weeks. My camera got a fixed location and makes there interval shooting. For the battery is far from enough. Also, I would have the camera for each battery change move because they can not be mounted on a tripod for its current purpose.
Since I use this power adapter, the camera is reliably supplied with power (partially around the clock). And Interval shooting great! And no matter how big I set the interval (45 seconds to 7:45, more or less possible), the camera now shoots all to the maximum possible number of 999 interval shooting.