Now the rules for this is you can use only one thing from your house any thing else you need to find like in the wild.
I would use a battery powered lamp beside the ability to light places up I would cover part of it in wood and if possible in iron if I could mine or find some. After covering it in wood I would use it like a weapon. If I could get some iron I would make a spike with it to make it more deadly, iron would be what I would want for a spike but wood would work to. The only problem would be that when the battery life ended I would have no more light. So after that I would use it like a torch by building a small circle then but some sticks in it to use like a torch. I could also use it to cook something on that I killed.
Here is a story I made up where I use this item. Also this story is fiction.
I had been left in the desert by a tribe of natives sitting there wondering what on earth to do I remembered that I had grabbed something from the house and had lade it under a tree only a few minutes ago. I began to look around and seeing some thing under a tree that looked like something from a house a ran forward and found a battery powered lamp of all things i had for some reason grabbed this thing that right then seemed would never work in the wild. Then I had a idea I began to look for wood and after finding some I began to cover the lamp in it. After a long time I had it covered in wood. I then began to look for a piece of wood that was jagged so that I could try and cut some of luckily after cutting two pieces of wood I was able to make the spike and I thought I should hunt for food but it was to dark then I realized I could use the light of the lamp while it still had battery to see in the dark. I was able to do that and after making a fire had a good dinner. The next day I began to walk toward the way the I had come (as there was a small town a few miles from the natives village) and soon after three days of walking I made it back to the town and survived a very dangerous place.