Duracell has incorporated select breakthrough technologies used in the original Duracell Ultra and put them into the new and improved CopperTop to give it increased performance and dependability at an excellent value. The CopperTop is best suited when you need reliable, long-lasting life from your everyday devices like remote controls, toys, personal stereos, flashlights, radios and pagers. In tests, the new and improved Duracell has shown up to a 25% longer life in toys compared to original Duracell batteries.