The report reads, “According to a preliminary investigation relayed to AppleInsider, poor quality generic charging peripherals, particularly AC to DC converters, are damaging the phone’s charge regulating circuitry over time. As a result of the damage, the battery is also not reporting the battery’s charge status to the iOS correctly.”
It also seems that 100% of the phones that have been examined were found to have this problem. It is unclear if these users knowingly charged their phones with third-party chargers, or if because these chargers were being sold and labeled like official Apple chargers that led these users to mistake them for the real thing.
Apple has warned customers in the past about using unauthorized third-party hardware. In fact recently Apple even claimed that 90% of the accessories sold on Amazon for Apple products were found to be fake. Of course given that Apple’s accessories are so expensive for such a simple product, they can’t really blame their customers who are looking to try and save themselves some money.