Mobile phone operator EE has recalled a number of its power bars, amid safety fears.
The power bars, which come from batch E1-06, after identifying a risk that the devices could overheat.
Up to 500,000 of the rechargeable bars, which can be plugged into a phone to provide power on the go, are thought to be in circulation.
All customers have been sent a text warning them of the risk posed by a "very small number" of the bars.
A statement from the company said: "EE has identified a very small number of incidents where Power Bars have overheated, all of which relate to batch E1-06 (written as Model:E1-06 on the side of the device), and could pose a fire safety risk.
"We're therefore recalling batch E1-06 and request that customers stop using them and return their device to a local EE store at their earliest convenience.
"Power Bars from any other batch aren't affected by this recall."
