The growing popularity of MP3 players, as well as their decreasing size, has led SMJ Electrical to launch a 15-pack of AAA batteries.

The launch, under its

Extreme Performance brand, will retail for £6.99

Marketing director Julie Hynd said: "MP3 players lead the trend for minimisation in electronics. With a need for smaller power sources, consumers are increasingly looking for AAA batteries and the 15-pack provides

the solution."