Following a lawsuit revealed back in October in which Apple exposed an issue with a large percentage of fake Apple adapters being marketed as “genuine” online, today the company has posted an official warning to customers.

The message, posted on the front page of the company’s support webpage, warns customers that counterfeit power adapters and batteries could pose safety issues. The company also offers customers that might have had a recent battery replacement the option to bring in their devices to an Apple Store or authorized service provider to check if the battery is genuine:

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Beware of counterfeit parts

Some counterfeit and third party power adapters and batteries may not be designed properly and could result in safety issues.

To ensure you receive a genuine Apple battery during a battery replacement, we recommend visiting an Apple Store or Apple Authorized Service Provider. If you need a replacement adapter to charge your Apple device, we recommend getting an Apple power adapter.

In the lawsuit launched earlier this year, Apple argued that as much as 90% of Apple adapters and cables marketed as genuine on Amazon are counterfeit. From the lawsuit:

Apple recently purchased a number of Apple power adapters and charging and syncing cables (collectively “power products”) that were directly sold by Amazon.com – not a third party seller – and determined that they were counterfeit. Amazon.com informed Apple that Mobile Star was its source for the majority of these counterfeit Apple products […]

Counterfeit power products, such as those supplied by Mobile Star, pose an immediate threat to consumer safety because, unlike genuine Apple products, they are not subjected to industry-standard consumer safety testing and are poorly constructed with inferior or missing components, flawed design, and inadequate electrical insulation. These counterfeits have the potential to overheat, catch fire, and deliver a deadly electric shock to consumers while in normal use.

Amazon responded by removing the products from sale, and Apple is in the process of suing at least one company that manufactured some of the the products.

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