From Bulbapedia, the community-driven Pokémon encyclopedia.
An ad for the batteries in Tokyo
Pokémon Batteries are produced by Maxell and began retailing in Japan on May 25, 2010 after first being announced on April 19 that same year. They are available in the sizes of AA and AAA. They are encased in blister packs which contain four batteries each, and also in shrink wrap packaging which contains eight batteries each.
The alkaline batteries have a new zinc-alloy casing which claims to be more child-friendly than previous batteries produced by Maxell.
On the first batteries released, Raikou was featured on the AAs along with Electivire on the AAAs. Maxell had planned to release twenty-one to twenty-three other characters on batteries in the future.
With each pack of batteries comes one of seven collectible stickers, showcasing individual Pokémon.
The back of a blister pack