MacBook Battery charging I recently bought a replacement battery for my MacBook battery. In Coconut Battery the Current charge has been as high as 8000 mah, yet the maximum capacity is listed as 6100. When the battery icon shows 100% has been reached the MagSafe light stays orange and doesn't turn green till the Current Charge exceeds the Maximum Charge.

Also, sometimes the laptop running on battery power will just shut off at 50%. When I plug in the charger it turns back on without a reboot but suddenly the battery icon shows 10 or 11 %..
Any ideas on these issues? Could my charger be defective and charging the battery too much?
The fact that your computer shuts down at 50% remaining charge and also that your MagSafe LED remains orange makes me think that either the replacement battery isn't an official Apple part, that it is defective/DOA, or that your logic boards SMC is corrupted and needs to be reset. 

If the battery is indeed new and Apple original than proceed with an SMC reset:

http://support.apple.com/kb/ht3964

This will tell the SMC chip to reset all power states and reboot so that it forgets the battery and MagSafe adapter momentarily and then rediscovers them.

Hope that helps