Portable batteries are a source of portable electrical power that can be used in a wide variety of appliances ranging from remote controls for toys to high-end portable devices. Due to constant product development and innovation, more and more appliances are placed on the market which require a battery to operate.Portable batteries come in a wide variety of shapes, sizes and chemistries. For the functionality of the appliance and the safety of the consumer, it is therefore important that the right choices are made when selecting a battery while taking into account some basic principles to ensure safe use of the battery and appliance.