SINGAPORE - Lenovo has announced the voluntary recall of four models of its ThinkPad X1 Carbon 5th Generation notebooks.

An unfastened screw in the products can damage the batteries, causing overheating and posing a fire hazard, the company said on Wednesday (Feb 7).

The four affected models are 20HQ, 20HR, 20K3 and 20K4. All were manufactured between December 2016 and October 2017.

They were sold through direct sales, online sales or through the brand's business partners during the same time period.

Affected customers will receive free service inspections, said Lenovo.

It advised customers to turn off their notebooks and refrain from using them until servicing is complete.

"Lenovo highly values our customers and regrets any inconvenience this recall may cause," it said.

The company has received three customer reports worldwide of an overheat condition related to an unfastened screw, which resulted in damage to the customer's laptops.

It has not received any reports of damage to other property or persons.

Those with the four models can visit their online Support Phone List at https://pcsupport.lenovo.com/sg/en/supportphonelist.

Customers can confirm if their products are affected by checking this website https://support.lenovo.com/X1C_5GEN_RECALL.

Those with further queries can call Lenovo Services at 800 852 6201 or an authorised warranty services provider.