Let the record show that the lifespan of a GP Powercell 9V battery in a Kidde i9050 smoke detector is just shy of 21 months. Thank you to the owners of this beach house for facilitating this inquiry. October 11, 2024 rossgradyinstagram, photography Post Views: 918 Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Like this:Like Loading… Related Post Views: 918 Like this:Like Loading… Related Let the record show that the lifespan of a GP Powercell 9V battery in a Kidde i9050 smoke detector is just shy of 21 months. Thank you to the owners of this beach house for facilitating this inquiry.