Experts say the 3 volt 20mm button batteries are often the worst, because they can contain a charge for as long as 10 years and they are big enough to lodge in a child's oesophagus.

Intel showed off its plans to jumpstart the wearable gadget industry with a new button-sized module called Curie during a keynote event at the 2015 International CES today.

Intel has unveiled a small, button-sized hardware module that the company says can deliver wearables in a range of form factors, including, rings, pendants, bags, glasses, and more. Dubbed Curie ...

The module also has, now don't laugh, 80 KB of SRAM and 384 KB of flash storage. This is all coordinated by an open-source Real Time Operating System (RTOS) that Intel is developing itself.