Panasonic Alkaline Plus Power AA Batteries vs Member's Mark AA Alkaline Batteries

Both are standard 1.5V AA alkaline cells in 48-count boxes, so the real split is shelf life and leak protection. The Member's Mark AA has the longer claimed shelf life at 12 years versus 10 for the Panasonic Alkaline Plus Power, and it carries an explicit no-leak guarantee. Panasonic is the better-known battery brand and its cells are widely used in remotes, toys and medical devices; owners of both report steady performance in low-drain gear. Buy Member's Mark for long storage and leak coverage; buy Panasonic if brand familiarity and a mercury-free zinc-alloy design matter more to you.

• Choose the Panasonic Alkaline Plus Power if you want a familiar battery name and a mercury-free cell rated for up to 10 years of storage.
• Choose the Member's Mark AA 48-pack if you want the longer 12-year shelf life and a stated no-leak guarantee for stored and backup batteries.