SHENZHEN, China, April 11 (Reuters) - China's Anker, one

of Amazon's ( AMZN ) largest sellers offering products from power banks

to phone cases, has raised prices on a fifth of its products on

the U.S. platform since Thursday, in a sign that tariffs on

Chinese goods are being passed on to U.S. shoppers.

Some 127 Anker products have seen an average

increase of 18% since Thursday last week, with the majority of

those occurring after Monday, April 7, when U.S. President

Donald Trump added an extra 50% import duty on Chinese goods,

according to data from e-commerce services provider SmartScout.

U.S. import tariffs on Chinese products now stand at 145%.

Beijing on Friday raised its tariff on U.S. goods to 125%, as a

trade war between the world's top two economies intensifies.

Anker and Amazon ( AMZN ) did not immediately respond to

requests for comment.

The move follows warnings from China's largest cross-border

e-commerce association that many Chinese companies that sell

products on Amazon ( AMZN ) are preparing to hike prices for the U.S. or

quit the market due to the tariffs.

"It's the most concerted effort (to raise prices) I've seen

across any brand," said Scott Needham, SmartScout's founder.

Anker, which has 5,000 employees and annual revenues of

22.17 billion yuan ($3 billion), has become a major seller on

Amazon ( AMZN ) since being founded by a former Google software engineer

in 2011.

On a call with investors on Monday, Anker said that it was

able to raise prices as it had bargaining power and because its

rivals were mainly Chinese and under similar tariff pressure,

but did not provide specifics.

It also said it would explore non-U.S. markets like Europe

and Southeast Asia.

($1 = 7.3218 Chinese yuan renminbi)