Lot of 36 Duracell - Hearing Aid Batteries Size 675 (Blue) I purchased these 4/21/18 at a local supermarket. The front of the package says that they are guaranteed while in storage up to 4 years. These are guaranteed to be good for another year and a half. "My dad wears hearing aids. We feel these Duracell batteries last longer than RayOVac Energizer. My dad LOVES the longer tabs. Much easier for the elderly to pick up the battery and install them ?" Size 675 Blue: Duracell size 675 hearing aid battery is designed so it's extra-long tab is simple to handle, and its packaging easy to open Ease of Installation: Designed with an extra long tab making Duracell batteries easy to handle and install. Long Lasting Power: Duracell batteries for hearing aids are engineered for long lasting performance. Guaranteed for 4 years in Storage: Duracell Hearing Aid batteries are guaranteed for 4 years in storage. #1 Most Trusted Battery by Hearing Aid Users: Duracell Hearing Aid batteries are available in 4 sizes 10 (Yellow), 312 (brown), 13 (Orange), 675 (Blue).