Cheap and Easy DIY Carbon Monoxide Detector wiring for boats

I #DIY wire up these inexpensive #kiddie carbon monoxide detectors that run off of 9V. I was having issues where the #battery backup was saying low battery after only a days use. Hopefully, tying them into the boat's #12V batteries will provide better results. I like to have the detectors running when motoring the boat or using the generator.