I know the original message was a while ago, but I am currently having problems with my computer recognizing the fact it has a battery. She is a Macbook Pro, 13 inch laptop, late 2011. No more MacBook warranty, but I have done any repairs on her myself, as needed. I like to think that I am fairly clever at repairs, and what I don't know, I research. Thoroughly. I am also very cautious about any time I need to take her apart, and use gloves, my computer repair kit, etc. With that being said, I’m no egotistical fool who thinks themself above any mistakes or need of help.
So, I also feel the need to inform you that my removal of the battery came about because I was working on an art project, with my computer safely out of harms reach (or so I thought) when my bottle of India Ink (undiluted) got flipped off of my desk and flew all over the central part of my keyboard and left side of my trackpad. (Me and a good portion of my wall and carpet as well, but, priorities.) India Ink is thicker, and dries quite quickly, but it was still a few seconds before I had a chance to try and soak it up and turn my computer off and unplug her. So after externally cleaning it (since it stains very heavily even after seconds) I undid her back, and took her battery out (unplugged it, I mean), trackpad out to clean, and lifted the rest out to check the damage. It really isn’t too severe, considering, so I plugged everything back in and pushed the power button. And nothing happened. I tried again, still nothing. So I plugged her into the power cord and she finally turned on. Lights lit up, typed fine, but I noticed the fan was going at a very high, very constant speed, even without any heavy usage. I then noticed my battery has a large X over it, and if I disconnect her from the plug, she dies in less than a minute. I have tried basically everything, even the SMC restart and still nothing.
I’ve no idea what is wrong with her, and short of buying a new battery, I’m not sure what else to try. Hopefully one of you may have an idea?