RAYOVAC® ALKALINE ULTRA PROTM C-12 BATTERY CONTRACTOR PACKS RAYOVAC® ULTRA PROTM BATTERIES ARE BUILT TO EXCEED THE PERFORMANCE DEMANDS OF INDUSTRIAL APPLICATIONS. THESE BATTERIES ARE CONTAIN A MERCURY-FREE FORMULA WHICH IS BETTER FOR THE ENVIRONMENT, AND ARE GUARANTEED AGAINST LEAKAGE. RECLOSEABLE CONTRACTOR PACKAGING TO HELP ORGANIZE AND PROTECT BATTERIES FROM DAMAGE AND SHORT CIRCUITING.