Apple is recalling 28,000 faulty batteries used to power its 15-inch Powerbook G4 laptops.
The batteries are found in 15-inch Powerbook G4s
An internal short circuit in the batteries causes them to overheat and could pose a fire hazard to consumers. So far no injuries have been reported.
If users find that they are using one of the faulty batteries, they are advised to stop using it immediately.
The batteries affected were made during December 2003 and are probably found in laptops sold since January 2004.
Some of the batteries may have been sold separately as back-up power supplies.
The faulty batteries have the model number A1045 and serial numbers that begin with HQ404, HQ405, HQ406, HQ407 or HQ408.
No other batteries for Powerbook or iBook laptops are affected by the recall.
Consumers that find they have one of the faulty power packs are being told to stop using it straight away and contact Apple.
If customers must continue using the faulty battery, Apple recommends that users do not leave the computer unattended and check regularly to ensure it is not overheating.
The computer maker has set up a free exchange programme to let consumers swap the faulty hardware for a fully working alternative.
So far Apple has received four reports of the batteries overheating, though none of these incidents have resulted in harm to Mac users.
A warning about the batteries was issued by the US Consumer Product Safety Commission.
The batteries were made by LG Chem of South Korea.
Notebooks have become increasingly important to Apple.
In the first three months of year, it sold some 358,000 laptops, making up just under 50% of all its computer sales.