The Energizer Ultimate Lithium 9V Block Batteries come in a 2-pack and have a shelf life of 10 years. These batteries are ideal for a variety of electronic devices that require a 9V power source, with a chemical composition of lithium for long-lasting performance. The Energizer brand is known for its reliable and high-quality batteries, making this product a dependable choice for powering your consumer electronics for an extended period of time.