Zigbee switch for battery powered decides?

Are there any products on the market to retrofit to battery powered devices? I’m thinking something I can insert between the battery terminals that can then switch via Hass. The use case would be haloween/Christmas decorations that aren’t mains powered so can’t make use of my spare sonoff switches. I have things like led light in the windows powered by batteries which I often forget to turn off at night or when I leave the house. It would be great to integrate these into my existing integrations.

I assume zigbee is the best bet, as they are low battery consumption? Does something exist, or something I can easily solder together in kit form?

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Did you ever find a solution. I have exactly the same use case.

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+1 came here looking for exactly this