These are record-edit dates, not a blanket refresh of every airline source.
Singapore Airlines overhead storage: retained the instruction to keep power banks out of overhead compartments, but distinguished the advisory’s “should not” wording from a separately established legal prohibition. United’s quoted restriction now explicitly identifies its checked-baggage context.
Removed unsupported daily-monitoring and 24-hour-response claims. Separated 2027 IATA guidance from confirmed airline adoption. mAh estimates, unreadable labels, unknown domestic-China 3C status, exact 100 Wh wording and dated evidence now require confirmation. Restricted Korean onboard rules to the carriers supported by the cited sources.
China 3C rule: sources replaced. The two pages cited before (Air China's US notice and Singapore Airlines' advisory) do not mention the 3C mark; the rule is now cited from China Eastern's and China Southern's pages, which state it in full.
Added Singapore's two-power-bank rule for all departures, from the Changi Airport and CAAS pages.
ANA: source link fixed (the previous link returned an error).
Lufthansa: now read in full on the Lufthansa Group page; no rule changed.
Cathay Pacific: 100–160 Wh changed from "not stated" to "not accepted" (our reading of its spare battery rule).
Qantas: removed a note about using a nearby overhead locker; the current page no longer says it.
Air India, IndiGo, American Airlines, British Airways: quotes now mark where separate list items were joined.
Asiana: quote corrected to the airline's exact wording (it had dropped "or e-cigarettes").