The SEC-HR4U4BPN 4-AAA Eneloop battery pack utilizes SANYO's advanced rechargeable battery technology allowing them to be recharged up to 1500 times, 33% more than any eneloop battery! They deliver excellent power performance. They come pre-charged and can be used immediately out of the package. These eneloop cells also have increased storage life and better extreme temperature performance than the original eneloop batteries.
One reason why the Sanyo AAA is popular is because of its Reliable.