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I just changed the battery on my mid-2009 macbook pro, but it won't charge. The battery came with a 50 percent charge. The magsafe light stays red and the icon in upper right corner says it's charging, and even shows "time remaining". But as I keep using it, the battery is drained percent by percent without adding any power to its storage (no I'm not running anything intensive). I did already reset the SMC a couple of times. Any ideas what might be the problem? Thank you in advance!