Duracell 9V Batteries Coppertop 12 Count: 6-2pks is a pack of 12 alkaline batteries with a voltage of 9V. The batteries are manufactured by Duracell and come in 6 packs of 2. The expiration date is not specified. The batteries are suitable for use in consumer electronics and other devices that require single-use batteries. The product does not come with a manufacturer warranty.