Loose batteries of any kind must not be included in luggage.
Lithium batteries can only be sent when they are securely installed within small electrical devices such as phones, tablets and laptops. It is permitted a maximum of one such item per shipment, the battery power must also be less than 100Wh (Watt Hours) and the weight of the electrical device with the battery installed must not exceed 5kgs.
Lithium batteries must not be sent if the electrical device or battery itself is known, or suspected, of being damaged or defective. Any products containing Lithium batteries which have been recalled from a retailer or manufacturer for any reason must also not be sent.
Strict security protocols exist surrounding the shipping of batteries within unaccompanied luggage and any person or company identified as the shipper on the supplied shipping documents is legally responsible to ensure 100% compliance with the above information. Failure to do so may result in the bag being removed from transit by regulatory authorities.
Some countries take the above policy further and prohibit the sending of all lithium batteries, for example Australia does not currently permit any batteries to be sent to or from the country within unaccompanied luggage.