As noted elsewhere, my Macbook's battery popped. I ordered a new one from Apple but then, based on advice here, I took my old one to a store, which replaced it. The new one just arrived. I was going to return it, but I thought it might be nice to have a spare around for long train rides or flights. What's the best way to store this? Should I charge it periodically, or only when I think I'm going to need it? Any advice for carrying it around? (I.e., should I put someone to cover the connecting pins?) Thanks.