2-Pack Energizer Ultimate Lithium Batteries, 9V - Lithium Batteries 2x. Condition is New. expirationuse by date is either 122028 or 122029 (2030!) The best 9 V batteries on the market today.... they last longer whether being stored (10 years or more)or being used, also they have a leak proof design. They may cost a little bit more but they’re worth it. perfect for smoke detectors. they give peace of mind. You will receive your batteries quickly. I try to ship same day depending on what time it is. You may receive two single packs instead of the 2 pack. Depending on available stock.