Had charging issues so bought correct wattage apple magsafe adapter. With new magsafe, laptop works fine, green light on, but not charging battery. It has 335 cycles and shows 5.944 volts. So, I bought a new battery off ebay (A1375). Installed new battery, and now it will only work on battery power and magsafe shows not connected, no green light as if its fried. I have 3 magsafes so its not this.
I did all the nvram, SMC, and battery out/power button SMC bypass resets to no avail. After a time, the battery died to 0%, and now the magsafe turned green again and works fine on AC power again! This is really strange. It acts as tho it can only run on DC or AC power but not both and never charges. I even put in the old battery, updated to the ~31 Jan 13 firmware and tried all the resets again. Nothing. So now it works just fine on AC power, green light on, 0% on the new battery not charging.
Lastly, I took it into apple and they wouldn't fix it for cheaper than 700 which more than totals the value of the laptop.
Any pro's out there have an idea? I don't want to toss a perfectly good laptop that has 100% pixels and runs perfectly in every other way.
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