Up to +80% more power* +Tester. (*Maximum difference vs. Duracell Simply AA in Digital Cameras. Results vary by device.). Best used in high drain and frequently used devices. Including POWERCHECK as integrated tester on every Ultra Power cell (except 9V). Duracell with Powercheck: less waste, more power! Powercheck, the only battery feature that prevents wastage. Duracell Ultra Power gives you reliable performance and long-lasting power in a broad range of everyday devices. You can rely on Duracell Ultra Power to power your digital camera, portable games console, shaver, remote controls, CD players, motorized toys, flashlights, toothbrushes, etc. Duracell Ultra Power has Powercheck TM. PowercheckTM lets you see how much power is left inside your battery.