all open package batteries are individully tested . Power up your electronic devices with this lot of 36 Duracell, Energizer, and Rayovac D batteries. With an expiration date of March 2031, these alkaline batteries will last for years to come. Made in the United States, these batteries are reliable and long-lasting. Use them in a variety of devices, from flashlights to portable radios. Don't let a dead battery ruin your day, stock up on these high-quality batteries today.@?!