Battery light

[beatule]

Hi, would somebody be able to advice me? I have a Vauxhall Meriva 2006 and when I am idling battery light comes on and the car turns off. After 10 seconds I am able to turn the engine back on and drive. Took it to the garage, they checked the battery and alternator but couldn't find any faults. What shall I do? I am worried when driving my car. Thank you.

[Rhubarb]

Drivebelt could be slipping, check condition and tension of drivebelt.

Also the engine idle speed could be too low.

Regardless of the battery being checked the battery could be weak, the electric power steering demands a lot on these..

[Rhubarb]

Any luck on this one?