Chosen Solution
I’ve got an original battery that was left for some time drained and as may be expected it lost in a way the ability to charge. “In a way” means that with controller bypass and my old trustful HP PSU I noticed the battery itself seemed alive and I managed to charge it until voltage got back at 12.5v in the cells and it shows it’s charged at about 50%. However, and this is the sad note, system doesn’t charge it further (although all battery data are there cycles, capacity which is very good and so on) nor gets powered by the battery. It seems from my limited battery technology knowledge that the controller got in the red light state and holds power flow in both directions. Anybody has ever looked deeper into Apple batteries architecture and knows of a way to reset the controller, if ever possible ?
Review this vid from Louis Rossmann What does knockoff charger do to Macbook Pro Retina? Most likely the systems charging logic was damaged at some point.
@arbaman so after checking the schematic and studied up on those batteries (yes battery analyzer on order that will enable me to actually read the data from those battery buses :-) I’d like you to check on something for me at your leisure
Can you measure the voltage on those pins? In the image the 3 on the left are negative and the 3 on the right are positive. Check the voltage on those pins with the charger plugged in etc. but the battery disconnected. Let us know.
The 1. blue circle shows the actual connection of the battery cells. You can connect some wires to that to charge your battery with a 12V charger. With the battery disconnected measure the voltage between those two areas. Top one is negative and bottom one positive. Next measure the voltage 2. on the negative and positive connections. You should get the same voltage as 1. Next measure the voltage between 1-3 and 1-4, let us know what you get. Now with your battery plugged in and charger connected, what voltage do you get on 2. Thanks
