Devices containing lithium batteries move under hazardous materials rules. Those rules shape shipping speed, packaging and what can be returned by mail.
Batteries are regulated as dangerous goods
Lithium cells can enter thermal runaway if damaged, short-circuited or defective, producing fires that are difficult to extinguish in an enclosed space.
Transport authorities therefore classify them as dangerous goods, with requirements covering packaging, labeling, documentation and quantity limits per package.
Requirements differ depending on whether cells ship alone, packed with equipment or installed in equipment, with installed batteries treated least restrictively.
Air transport carries the tightest limits
Passenger aircraft face restrictions on shipping certain battery configurations as cargo, along with state-of-charge limits for cells shipped alone.
Carriers add their own conditions above the regulatory minimum, and some decline categories of battery shipment entirely.
The practical effect is that some items ship by ground regardless of the service level selected, which is why a small part can take a week to travel a short distance.
Testing and documentation are prerequisites
Cells and batteries must pass a defined series of transport tests covering altitude, thermal cycling, vibration, shock and short circuit before they can be shipped.
A summary of those test results must be made available by manufacturers and distributors, and carriers may request it.
Shippers offering batteries without that documentation encounter refused shipments, which is a common obstacle for small importers and marketplace sellers.
Returns and recalls face the same rules
A damaged or recalled battery is subject to stricter provisions than a new one, and in some cases cannot be shipped by air at all.
That is why a recall program may require drop-off at a collection point or provide specialized packaging rather than a simple prepaid label.
Retailers accepting battery returns in store are handling the same regulatory question, and their staff follow procedures for isolating damaged units.
Disposal is regulated separately
Lithium batteries are not accepted in ordinary household waste in many jurisdictions, and improper disposal has caused fires in collection trucks and sorting facilities.
Retail take-back programs and municipal collection points exist because the recovery of these materials requires specialized processing.
State rules on collection and producer responsibility vary, so a household should check local requirements rather than assume a national standard applies.
Devices with glued-in batteries complicate collection further, since the whole product must be handled as a battery even when the rest of it would be ordinary electronic waste.