Panasonic has developed a flexible lithium ion battery for use in wearable devices that maintains its electrical characteristics even after repeated bending.

The battery means more freedom for designers of wearable devices, who are currently constrained by the need to inflexible areas to hold the battery and some electronics.

Three prototypes of the battery are on show at this week’s CES in Las Vegas. The largest is 40mm by 65mm, the medium size is 35mm by 55mm, and the smallest is 28.5mm by 39mm.

All three are just 0.45mm thick — that’s considerably thinner that a credit card, which is 0.76mm thick. They can be bent up to a radius of 25mm or twisted to an angle of 25 degrees.

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Panasonic shows off a flexible battery for wearables