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The AA batteries come in blister-packages of two, four and eight pieces, while the AAA Batteries come in blister-packages of two and four pieces. The eneloop combipack (HR-3UTGA-4UTGA-8BP) contains four pieces AA and four pieces AAA batteries.
More than 80% of all batteries sold worldwide are either AA or AAA. Therefore SANYO has chosen these two most popular sizes for eneloop.