Consumer electronics maker Sanyo Electric Co. and toy maker Tomy Co. said Thursday they have jointly developed safer rechargeable nickel hydride batteries for use in toys.
Company officials said the batteries are safer because they become less hot when being recharged. They will go on the market in November.
Even if children mistakenly put them in a charger upside down, the batteries will not get hot, the firms said.
A set of two batteries with a charger will sell for 3,980 yen, and two batteries alone for 1,100 yen.
The firms aim to sell 200,000 batteries by the end of March.
