Duracell power check
DURACELL PowerCheck Batteries allow consumers to conveniently test battery power anytime, anywhere. DURACELL PowerCheck Batteries have an on-battery fuel-gauge tester which measures remaining battery power. By simply pressing the dots on the side and bottom edge of the battery, a display on the side of the battery reveals an easy-to-read graduated measure of remaining battery power.
Source: duracell.comAdded: 14 June 2006