That's my motto: Get a back up. Then, get a back up of your back up. After that, get a back up of your back up, back up. You can never have too many. Ever. At one point I went through four back ups for various reasons before getting one that worked at the time. Boy, was I ever glad that I had them to go to. I know it doesn't help you now, but as soon as you can, get some back ups, they don't have to be fancy, even pen style batteries are good in a pinch.