I had a li ion laptop battery about 2 years ago, there's a safety test sticker dated July 2015 on it. I've never had it in my laptop, it's just been sitting in storage up until now. My current one is on it's way out so will this stored one still be good and safe to use? I put it in my laptop and it won't turn on with it, but i wanted to ask before applying a charge to it just in case it could be dangerous or something.