Reliable, long lasting power for your medical, electronic, security, and other compatible devices, Duracell Lithium Coin batteries are guaranteed for 10 years in storage, so you can be confident they will be ready when you need them. Duracells 20mm lithium coin batteries have more child safety features than other leading brands . Its latest innovation is a non toxic bitter coating on the cell that is designed to help discourage swallowing... See full description for further details