A laptop's installed battery is exactly the case USPS Publication 52 was written to allow: lithium-ion cells inside the device they power, under 100 Wh, cleared for air or surface — and at one installed battery, exempt even from the lithium-battery mark. What's actually worth comparing is the service, not the eligibility. Prices below came from the SMKlog calculator on 2026-08-18; the mailing rule is quoted from USPS's own Publication 52, read the same day.
The same checkout battery confirmation covers a laptop on Ground Advantage or Priority Mail; only the price and the window change.
“Lithium metal and lithium-ion cells and batteries installed in or packed with equipment may be mailable via air or surface transportation.” Individual cells are capped at 20 Wh, batteries at 100 Wh, with a maximum of eight cells or two batteries per mailpiece. USPS, Publication 52, Appendix C (pub52apxc_032), pe.usps.com, read 2026-08-18
A consumer laptop battery sits well inside that 100 Wh figure, and a mailpiece holding one machine holds a single battery pack, so the two-battery cap is not a real constraint either. The mark carries its own carve-out: the same instruction requires a DOT lithium-battery mark on lithium-ion mailpieces except, among a short list, those with no more than two batteries installed in the equipment they operate — which is precisely a boxed laptop. What the SMKlog checkout asks for is an honest description of the item and one battery confirmation step before the label prints, the same step regardless of which USPS service is selected.
The same page draws a firm line around batteries mailed on their own. “Individual lithium metal (or lithium alloy) and lithium-ion (or lithium polymer) batteries (without equipment) are mailable in limited quantities via surface transportation only,” capped at 5 lb per mailpiece, with air transport prohibited outside a narrow Alaska exception. That rule is for a battery shipped with no device at all. A spare battery riding in the same box as the laptop counts instead as packed with equipment — mailable by air under the allowance quoted above, though the mark exemption covers installed batteries only, so the packed spare puts the lithium-battery mark back on the box.
USPS publishes two domestic services that both comfortably cover a laptop box, and they part ways on price and window rather than on eligibility. Figures below are quoted from USPS's own service page, read 2026-08-18; it does not publish a price for either.
| USPS service | Published weight ceiling | Published delivery window |
|---|---|---|
| USPS Ground Advantage | 70 lb | 2 to 5 days |
| USPS Priority Mail | 70 lb | 2 to 3 days |
A packed laptop box clears both ceilings without effort, so size is not the decision here. The two real quotes below show how the price and the window actually split on two different lanes.
We priced a 14-inch laptop in its original box — 15 × 11 × 3 in, 5 lb packed — from Berkeley Heights, NJ 07922 to Chicago, IL 60614. Five rates came back; these are all of them, not a curated subset.
| Carrier and service | Price | Estimated transit |
|---|---|---|
| USPS Ground Advantage | $12.05 | 3-4 business days |
| UPS Ground Saver | $11.70 | about 4 business days |
| UPS Ground | $13.23 | 2-3 business days |
| FedEx Ground Economy | $14.31 | 5-6 business days |
| USPS Priority Mail | $17.66 | 3-4 business days |
Ground Advantage was the second-cheapest rate on the board, a step above UPS Ground Saver and well under its own faster sibling, Priority Mail. USPS's published 2-to-3-day window for Priority Mail did not show up as an edge on this particular lane; the estimate we received matched Ground Advantage's own window. Quote your own lane before assuming that holds.
A bigger box and a longer lane change the picture. We priced a 16-inch laptop with charger in a padded shipping box — 19 × 13 × 4 in, 8 lb packed — from Berkeley Heights, NJ 07922 to Seattle, WA 98101, captured the same day.
| Carrier and service | Price | Estimated transit |
|---|---|---|
| USPS Ground Advantage | $20.84 | 5-6 business days |
| UPS Ground Saver | $22.85 | about 7 business days |
| UPS Ground | $22.94 | 7-8 business days |
| FedEx Ground Economy | $22.59 | 8-9 business days |
| FedEx Ground | $29.69 | 7-8 business days |
USPS Ground Advantage was the outright cheapest rate on this lane, about two dollars under the next three rates and nearly nine under FedEx Ground, and Priority Mail did not return a rate at all for this heavier box. That is a real gap, not a rounding difference, and it is the opposite of the light-box result above — which is the whole reason to quote your own weight rather than reuse someone else's number.
USPS revises its rates on its own schedule, most often in January. What is above sets one capture against one reading of USPS's own pages, both dated; pull your own quote before you tape the box shut.
Yes. USPS Publication 52 allows lithium-ion cells and batteries installed in or packed with the equipment they power to travel by air or surface, capped at 100 Wh per battery and 20 Wh per bare cell, with a limit of two batteries or eight cells in one mailpiece. A laptop carries one battery, nowhere near either ceiling, and at that count Pub 52 does not even require the lithium-battery mark on the box.
Mostly speed, and it shows up more on some lanes than others. USPS lists Ground Advantage at 2 to 5 days against Priority Mail's 2 to 3 days, both capped at 70 lb. In our own quotes, Ground Advantage undercut Priority Mail by several dollars on a light box heading to Chicago; on a heavier box to Seattle, Priority Mail did not return a rate at all.
Yes, as packed-with equipment. Publication 52's allowance covers batteries installed in or packed with the device they power, and its two-battery mailpiece cap leaves room for one spare, though the spare costs the mailpiece its mark exemption. A battery mailed with no device at all is the stricter case: 5 lb per mailpiece, surface transportation only.
In both boxes we quoted here, yes: by $5.61 on the Chicago box, and on the Seattle box it was the only USPS rate returned at all. Weight, box size and the specific lane all move the comparison, so it is worth pulling both rates rather than assuming the cheaper-sounding name wins.
The same one it needs for any carrier: a carton with room for two inches of padding on every side of the machine, with the screen kept off every wall of the box. The full method, with its own captured price, is in the laptop shipping box guide.