Battery Operated Led Christmas Lights

Ok, here's the deal. For Christmas, I have a big star that I made last year in light of rope and flashing lights that I put on the mast (mast), which holds my weather station. This year I'm adding another star added to the inside of the large star made of light blue to indicate the son, we are expecting in April. I also wanted to put a single LED light flashes in the little star for a heartbeat (and piss off the neighbors ... hi hi). My problem is: I bought a battery operated LED strobe light that you're supposed to use on a bicycle, running, etc. The documentation says that the light for about 100 hours - not close enough for the Christmas season . I want to find something that will allow me to blink the LED of the power that is already underway in light of the star, but I find nothing there that is a flashing LED AC-powered / strobe. I can not run DC-mast if necessary, for example from a 6 volt lantern battery. Ideas?

LEDs are DC only. You can put a diode in series with the AC. But check the voltage of the AC.

You can run a separate DC supply.

I guess it uses AAA batteries. Why not use the same number of D batteries (because they are the same voltage and have a capacity much higher). son solder terminals and wire into your signal.