The border is not the first wall this shipment hits; the watt-hour line is. Every major carrier's consumer battery allowance, domestic or international, tops out around 100 Wh for a lithium-ion cell mailed on its own, and a common e-bike pack sits between 360 and 900-plus Wh. We read FedEx, UPS and DHL's own current battery pages on 2026-08-19 to see how each one treats a shipment that far past its own line, and ran a real pack through our own checkout toward an international forwarder to see how far it gets.
Nothing about crossing a border changes the watt-hour math that already stops this shipment at home.
FedEx's how-to-ship-batteries page, read 2026-08-19, sets the Section II consumer allowance at a lithium-ion or polymer battery of no more than 100 Wh, with no single cell over 20 Wh. The same page's lithium battery flow chart lists a prohibition on offering UN3090 and UN3480 — a lithium metal or lithium-ion battery shipped by itself, which is exactly the category a spare e-bike pack falls into — under that Section II route. For anything outside that, the page points shippers to the FedEx Logistics lithium battery shipping guide for international air and ocean requirements and to the FedEx international hotline to confirm acceptability for a specific destination.
UPS's how-to-ship-batteries page, read 2026-08-19, does not print its own international watt-hour ceiling. It directs shippers to the federal 49 CFR Lithium Battery Guide for Shippers and the IATA Battery guidance document, and names the UPS Hazardous Materials Support Center, 1-800-554-9964, as the line for anything past a routine domestic case.
DHL's battery-shipping page, read 2026-08-19, states that lithium-ion and lithium-polymer batteries are classified as dangerous goods by IATA, and that the shipper carries legal responsibility for meeting the IATA Dangerous Goods Regulations: the correct UN number, an IATA dangerous-goods label, a safety data sheet, and a battery state of charge held at 30 percent or less for air movement. The page publishes no watt-hour ceiling of its own and does not mention e-bike batteries by name.
None of the three describes a retail path for a battery this far past 100 Wh. All three point past their own consumer pages toward a hazardous-materials desk, a certified forwarder, or a dangerous-goods guide, which matches what our own checkout returned below.
Rather than assume the border made the difference, we ran the same spare pack used on our domestic e-bike battery page toward an international forwarder instead of a plain domestic address: 8 lb, packed in a 14 × 5 × 4 in box, described as a spare 48V 14Ah lithium-ion e-bike battery pack, no bike, from Berkeley Heights, NJ 07922 to a Miami, FL 33101 forwarder hub. Captured against production on 2026-08-19.
Zero rates came back, on both the parcel and freight sides, the same outcome our domestic guide found on a purely domestic lane. That is the useful fact here: the block sits on the watt-hour figure, not on where the box is ultimately headed, so routing the shipment toward a forwarder does not clear it. A battery this size needs a dangerous-goods account before geography enters the picture at all.
FedEx, UPS and DHL each maintain a dangerous-goods contract path separate from their consumer sites. That path expects UN38.3 test documentation for the cell, a dangerous-goods declaration, and typically a standing account rather than a one-off label purchase.
Businesses that export e-bike batteries in volume generally route through a freight forwarder holding its own dangerous-goods certification, which absorbs the paperwork the carrier's own consumer counter cannot process.
A single spare pack rarely justifies a sea shipment on its own, but a manufacturer or reseller moving many packs at once typically ships that volume by ocean under the International Maritime Dangerous Goods Code, arranged through a licensed forwarder rather than a parcel carrier.
None of the three is a job for a domestic parcel checkout, ours included. If the battery is staying inside the bike rather than traveling alone, the shipment is a different regulatory class, UN3481 instead of UN3480, but our own checkout still routes an installed pack over 100 Wh to manual review rather than an instant rate, so it is worth checking that path directly rather than assuming installed solves the problem.
Battery watt-hour ratings vary by manufacturer; check the label on the actual pack rather than assuming it matches the 48V 14Ah example used here. Dangerous-goods rules are revised on a schedule set by IATA and each carrier separately from this page.
Not through a retail counter. FedEx's own lithium battery page, read 2026-08-19, caps a Section II consumer shipment at 100 Wh per battery and 20 Wh per cell, and its lithium battery flow chart lists a standalone lithium-ion battery, UN3480, as a prohibited entry under that same Section II. An e-bike pack is several times over that line, which routes it to a dangerous-goods shipment rather than a counter transaction.
UPS's how-to-ship-batteries page, read 2026-08-19, does not publish a separate international watt-hour figure. It points shippers to the federal 49 CFR Lithium Battery Guide for Shippers and the IATA Battery guidance document, and names the UPS Hazardous Materials Support Center, 1-800-554-9964, for anything past the routine case, which an oversized e-bike pack is.
DHL's own battery-shipping guidance, read 2026-08-19, states that lithium-ion and lithium-polymer batteries are classified as dangerous goods by IATA and that the shipper is legally responsible for meeting the IATA Dangerous Goods Regulations, including an IATA label, the correct UN number, and a state of charge held at 30 percent or less for air transport. It does not publish a watt-hour ceiling of its own or mention e-bike batteries specifically.
No. We ran the same spare 48V 14Ah pack used on our domestic e-bike battery guide, 8 lb in a 14 x 5 x 4 in box, from Berkeley Heights, NJ to a Miami, FL forwarder hub through our own checkout on 2026-08-19. Nothing priced, on either the parcel or freight side. The block sits on watt-hours, not on the destination, so a lane headed toward an international forwarder fails the same way a purely domestic one does.
Through a dangerous-goods account, not a retail label. Sellers and manufacturers who move packs this size routinely hold a contract with a carrier's hazardous-materials desk, or route the shipment through an IATA-certified freight forwarder for air, or a licensed forwarder working under IMDG rules for ocean. None of that is a checkout box on a consumer site, ours included.
Runs SMKlog and its live rate comparisons across USPS, UPS, and FedEx. The guides here are built from the same carrier data the calculator quotes from, with prices captured on the date shown on each page. Based in Berkeley Heights, New Jersey.