Pokémon-themed batteries are being recalled in Japan as users have found some of them to overheat and generate smoke.

The Pokémon Company — which manages the Pokémon franchise — released a warning yesterday on its website (link in Japanese) regarding two of its batteries, which were adorned with an image of Pikachu and the series' Pokéballs.

Image: The Pokémon Company

The company is asking owners to refrain from using the batteries, which were made in collaboration with Tokyo-based electronics retailer Near Direct.

The batteries were only available through the Pokémon Center, Pokémon Store, Pokémon Center Online and Amazon in Japan, but have been found to be on sale on Amazon overseas and eBay. Batteries that were on sale between Sep. 16, 2016, and Feb. 13. 2017, are affected by the recall.

The Pokémon Company hasn't said if it would accept returns from overseas users.