We only issue Honeywell carbon Monoxide alarms, just had a new version in with 10 year battery life and a big warning message on the front when it goes off. The old one had 6 year life and never had a complain re one. I fact I have one my self.
I fit wood burning stove all throughout the winter. We supply and fit Fire Angel Carbon Monoxide alarms with each job.
They have a 10 yr life, never had a complaint or problem with them.