Fujitsu-Siemens has recalled a quarter of a million laptop batteries due to a fire risk.

The recall - tenderly termed a "battery exchange" by the company - affects its Amilo line and users have been advised to stop using them immediately. The laptops can still be run from main power and Fujitsu-Siemens will replace the battery free of charge.

The rechargeable lithium ion batteries involved in the recall have model numbers ending in G1L1, and were supplied with the following Amilo notebooks: A7640, A1640, M1405, M1424, M1425, M7405, M7424, M7425 and Pro V2020. The model numbers can be found in the middle of a label on the underside of the computer, the company said.

The batteries went on sale in October 2004, and may also have been sold separately as spares, the company said.

More information about to obtain a replacement battery can be found at www.fujitsu-siemens.com/batteryexchange

The company has received four reports of batteries overheating but no injuries. In May, Apple recalled 128,000 notebook computer batteries after receiving six reports of them overheating.