I received an answer from Panasonic as I had queried what was the proper AC adapter for the DMC-FZ150. This is the response:
show details 10:13 PM (2 hours ago)
Thank you for your inquiry. Unfortunately the DMC-FZ150K dose not support an external power source.
Therefore there is no listed AC adapter for the unit.
We hope this information is helpful to you. Thank you for choosing Panasonic.
I hope this proves to be incorrect or I can find a work around as I will be doing a lot of time-lapse. I suspect it is wrong as when I mentioned before I previously called their tech support and got a gum smacking young man that didn't seem to know what a SDHC card was, and after looking it up was told incorrectly that the DMC-FZ150 did not support UHS-1 memory.
There is a rubber flap at the battery door edge that I suspect would accommodate a battery shaped adapter that plugs into an external AC power source. For example the Canon SX230 HS, comes retail with such a device by default.
Not a deal breaker for the DMC-FZ150 but something I will have to look into.