This is not the first time Lenovo has had to recall its batteries but this one is not about anything overly dangerous. These batteries are merely defective and cause mundane things like "irreparable damage" errors popping up.
Other indications are your battery life becoming very short. a message saying that the battery cannot be charged. Lenovo has announced that they will replace the batteries for free and have even posted a tool to help you determine if you have a bad battery.
The affected models are R60, R61, T60, T61, X60, and the X61,

Source