The following guidance is from the environment agency:

• clothing where it includes a fundamental feature which needs electricity to function, such as a gym top with a heart rate monitor, heated walking jacket or a hat with integral speakers
• e-cigarettes
• electric bicycles – these are not covered under the ‘means of transport for persons or goods’ exclusion unless they are ‘type approved’ – for details see European Commission guidance
• fish tanks – report the whole weight of a tank with a light, heater or pump supplied as a single unit
• games consoles – report in this category even if they have extra functions like a DVD player
• gym equipment – report the whole weight of the product