light in fridge

I don’t have a shabbat mode on my rented refrigerator. The lights can’t be disabled. Can I cover bulbs with a cloth so that I am not using the light? Or am I not allowed to use on the chag? thank you

Electricity from battery

Hi i know by the Tshuva by the fridge light the Rav says that Electricity is Safek Mdoriysa Safek Mdrabunan. so i want to jnow if this safek is only where it plugs into the wall? Or if it comes from a battery (like a phone,laptop, etc.) is it Mdrabanan forsure?...