The Renata CR2450N comes in a pack of two batteries and is the perfect button size battery to help you power watches and personal assistants alike. The batteries have been crafted out of perfection in Switzerland and this is why they come with a baton of trust. The lithium ion batteries do not discharge easily and this is why they can be stored for a long time as well. The button cells last very long and have been known to last as long as two years.