Apple has been named as a defendant in five separate class-action lawsuits, the company revealed to the Securities and Exchange Commission today.

The company says it has begun its investigation into the five claims, reports Dow Jones News wire.

It's alleged the company misrepresented its iPod digital music player's battery life; violation of a California law for unfair competition and violation of California's Consumer Legal Remedies Act have also been alleged; allegations of false advertising, fraudulent concealment and breach of warranty have also been made.

Apple is also one of eight defendants named in a patent infringement suit filed by East Texas Technology Partners January 23. The plaintiff's lawsuit alleges Apple infringed a patent (6,574,239) relating to "virtual connection of a remote unit to a server."

Apple has also been named as defendant in a class-action filed January 9 in California, "alleging improper collection of sales tax in transactions involving mail-in rebates", Dow Jones reports.