Integrating Battery String Lights

Hi All,
I have quite a few battery operated string lights, and was wondering if there was some way I could integrate them into HA, as it’s a true pain in the @$$ to walk around and turn them all on/off even if we remember to, I would prefer a Z-Wave option, but I’m open to any other options.

The string lights operate on 4 x AA batteries in series (6V), I would also prefer to keep the battery as the power source and not have to run extention cables all around the house for power.

Based on the manufacture specs, the batteries should last around 20 days, when operated for 6hrs per day, which is more than what we need, as you may already guess, yes these are Xmas lights which are only up for the next couple weeks.

Thanks