@neven Sounds good. I assume you have also reset the PRAM during your troubleshooting? Sorry it didn't work for you. Yes...it's quite frustrating. The other option is using a different supplier for your battery completely or going for a used battery from iFixit to see if that gets you by. Good luck and if you get it sorted out please drop a note on this thread.

I would like to add to this discussion. I have ordered 2 batteries from iFixit for a Mid2011 MacBook air and both are looking great with coconut battery....however : 1) Both are showing "Replace Now" in OSX 2) Both do not supply power to the system. When the power adapter is disconnected, the MacBook dies. 3) I have reset the SMC and PRAM. 4) I have tested both batteries in two different MacBook Air Mid2011's I have in stock which are in perfect shape and function normally. 5) Using other batteries I have in stock for these models, all batteries work normally. It's only the new ones supplied by iFixit that act this way (Show "Replace Now" in the OSX battery status and also will not supply power when the power adapter is disconnected) 6) Again, this happened with both MacBook Air's Mid-2011 I have here that are in perfect working condition. I know this is an old thread. But I wanted to interject there might be something else going on besides a faulty IO board or Logic Board issue. There seems to be a...