... such as primastic, cylindrical, circles, polygons,flexible batteries and so on.HGB batteries do not contain Mercury, No fire, No leakage ... 3 0.4mm: The World Thinnest, Flexible, Rechargeable Polymer Li-ion Battery HGB has succeeded in the development of an ultrathin ... but it is also environmentally friendly as unlike conventional rechargeable batteries, it does not contain any harmful heavy metals, such ...