FILE PHOTO - A salesman checks a customer's iPhone at a mobile phone store in New Delhi
FILE PHOTO – A salesman checks a customer’s iPhone at a mobile phone store in New Delhi, India, July 27, 2016. REUTERS/Adnan Abidi/File photo

SAN FRANCISCO (Reuters) – Apple Inc <AAPL.O> defrauded iPhone users by slowing devices without warning to compensate for poor battery performance, according to eight lawsuits filed in various federal courts in the week since the company opened up about the year-old software change.

The tweak may have led iPhone owners to misguided attempts to resolve issues over the last year, the lawsuits contend.

All the lawsuits – filed in U.S. District Courts in California, New York and Illinois – seek class-action to represent potentially millions of iPhone owners nationwide.

A similar case was lodged in an Israeli court on Monday, the newspaper Haaretz reported.

Apple did not respond to an email seeking comment on the filings.

The company acknowledged last week for the first time in detail that operating system updates released since “last year” for the iPhone 6, iPhone 6s, iPhone SE and iPhone 7 included a feature “to smooth out” power supply from batteries that are cold, old or low on charge.

Phones without the adjustment would shut down abruptly because of a precaution designed…