As the package says, batteries are not included. But where would Christmas morning be without these tiny power packs, which have only been around for a little more than a 100 years. The dry cell (D size) was introduced in 1898, and was generally used for flashlights. The 9-volt battery first made an appearance in 1956, followed by the AA and AAA batteries in 1959.
The very existence of small, standardized batteries made electronic toys possible. The first companies to take advantage of that were Japanese toy makers, who needed new markets after the devastation of World War II. Batteries had been used in toys before, but it was the Japanese companies that started using the electricity for more than lights or noise -- they made robots that could move around. One popular item was Robby the Robot, which appeared in the 1956 film Forbidden Planet, but there were several imitators. By the 1970s, video games and small electronic toys were everywhere.
These days, kids want iPhones and iPads or Chromebooks, which use more powerful technology than that found in alkaline batteries. But even the most advanced gadget runs on technology developed a century ago.