Amazon has been convicted of trying to air dangerous goods by air and has been fined £ 65,000.
The internet giant is trying to transport lithium.
Ion batteries and flammable aerosol from 2014 to 2015.
Convicted in the royal court of Southwark on charges of violating air rules leading to the delivery of dangerous goods on board for transport.
An Amazon spokesperson said: "The security of the public, our customers, employees and partners is an absolute priority.
"This prosecution was brought by the Civil Aviation Authority under 2002 of the Aviation (Dangerous Goods) Regulations.
These items were shipped in four batches between January 2014 and June 2015 to flights inside and outside the UK.
Only when the goods were inspected by Royal Mail before departure and seized before arriving at the plane was found.
The court heard Amazon tried to ship a lithium.
The day before January 7, 2014, Ion batteries arrived in Jersey, and flammable gas aerosol arrived in Romania on a similar date.
Another shipment to Ireland the day before July 17, 2014 contained another aerosol, while Amazon illegally tried to send two more lithium-
During the period from May 12-20 to June 3, ion batteries were shipped to Northern Ireland.
Kate Staples, CAA's general counsel, said: "There are important international and domestic restrictions on the Prohibition of the transportation of certain goods that pose a risk of flight safety.
"These dangerous goods include lithium batteries, which are prohibited from being transported as mail or goods on passenger planes unless installed in or equipped with equipment.
Prosecutor Martin Goudi told the court: "in the appropriate circumstances, the battery, even the new, undamaged one, may overheat and may cause burns, explosions or fires.
Lawyer Stephen Spencer, who defended the online giant, said in court: "We're not talking about Amazon dragging a propane tank on the plane.
They are daily necessities and people should look at them from this perspective.
Amazon said in a statement: "We ship millions of products every week and are confident in the complex technologies and processes we develop to detect potential shipping hazards.
"We have been working on further improvements and will continue to work with the CAA in this area.