Duracell Ultra Power Batteries AA 12 pack Value pack of twelve AA alkaline batteries. Duracell Ultra Power is the most powerful Duracell battery ever, giving more energy, efficiency and power. Long lasting power, guaranteed. Especially suited to cameras, camcorders, MP3 players, PDAs, grooming and toys Includes Powercheck, an integrated tester that always let's you know how much power is left in your battery