Last week, Apple released an update for users of certain MacBook and MacBook Pro laptops, the process inadvertently uncovering a a batch of flawed batteries.

Following up on this, the company has said that while the batteries don't pose a safety risk, users should request replacement units.

The affected batteries will have one or more of the following symptoms:

-Battery is not recognized causing an “X” to appear in the battery icon in the Finder menu bar.

-Battery will not charge when computer is plugged into AC power.

-Battery exhibits low charge capacity/runtime when using a fully charged battery with a battery cycle count (as shown in System Profiler) of less than 300.

-Battery pack is visibly deformed.

For the full write up, take a gander David Morgenstern's piece over at The Apple Core.

If you've seen this on your end or have feedback or workaround, let us know in the comments or forums.