Charger not communicating with Battery
I have a mid 2012 unibody MBP with some odd power issues.
It started when one of my chargers stopped working and I started noticing that the battery indicator would show an unusual amount of charge left such as %30 when I knew it should have close to %100, or the other way around. Then it began having red battery icons, and the laptop would intermittently just go into sleep or shut down completely when I would unplug my charger.
I did an SMC reset and it seemed to help for a bit, but would start up within a week or two and eventually got to the point where the SMC reset wouldn't do anything and being able to get my laptop running solely on battery power (being able to wake it after unplugging, or having it just startup on its own when opened) was pretty rare. Finally the battery icon disappeared completely. I tried getting it back in system preferences and it will show up as charging for a second then disappear right away and uncheck the box. When checking my battery it seemed to indicate it was fine, but it was a little high on charges and I figured I'd try a battery swap to see if that would fix it.
I swapped the battery and Coconut is essentially seeming to say it's not there. Manufactured in 1979, power adapter connected, but then saying not connected in battery info, no charge capacity, etc. Similar to when the previous battery was connected, when i try to do an SMC reset nothing seems to happen, magsafe adapter just stays a solid green (no matter what charger I use), battery icon never appears. I know it seems like the I/O but it seems strange as with the old battery it would still occasionally wake up with just the battery.
Is this a good question?
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What is the color of the MagSafe charger LED Green or Amber? Also your system has an onboard battery tester When you press the button how many Green LED light up or is just one blinking?
by Dan
The adapter would change from green to amber when charging up until maybe a day or two ago, now it will only stay green. When I try and do an SMC reset it stays green as well. The battery tester has been strange as well, as sometimes it would just stay with all lights on without it being touched, and sometimes it would work normally showing the charge level. When I brought my computer home today with the new battery in it, and having been connected to power all day it had I think three lights staying on without me touching the tester which I hadn't seen before, though it has since stop working all together. I swapped back to the old battery and nothing has changed with that at all.
by John Berner