Opposite of a rant- a kudo. We use Kidde brand smoke detectors and carbon monoxide detectors. The CO detectors have an oddball 8v proprietary battery in the event of power failure. The battery on one died on the weekend, I contacted their customer service by email looking for a replacement battery. They are sending me a new detector instead because apparently the batteries should be good for ten years and this one was only 5 years old. I am not affiliated with them in any way just thought that such service deserved a shout out.