The top battery charge voltage on my MacBook when the charge reaches 100% is just about 12.11 V, when it should be close to 12.6. I have replaced the battery there times, swapped chargers, reset SMC, PRAM, etc., and nothing fixes the issue. After about four cycles the newly replaced batteries health drops to the order of 60%. The first time I thought the replacement battery was faulty, but every new replacement battery, even from different vendors (including iFixit) did the same. I believe the trouble lies in the circuit or firmware that determines the maximum safe charge voltage and never lets the batteries reach their peak capacity. Any ideas about how to fix this issue?
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=== Update (05/25/24) ===
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Dear Dan,
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I followed your instructions and the MacBook behaved as you indicated, but this procedure did not fix the MacBook manufacturing date. It still says 2024-11-11 (please see CoconutBattery display below).
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You indicated that the batteries charge level issue is likely an issue within the SMC comparator logic (2 resistors often get damaged by knockoff chargers). Can you please advise where are these resistors located? Can I check them? (I have multimeter, oscilloscope, small soldering iron, and a friend has an SMD soldering station).
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I never used a knockoff charger, but the original one started to heat at the Magsafe connector due to increased resistance on the ground lead caused by cable wear, heating that corner of the MacBook. I eventually repaired it but maybe the heat damaged or unsoldered the comparator resistors, if they are close to the Magsafe connector.
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Thanks for your help I really appreciate your dedication.
The top battery charge voltage on my MacBook when the charge reaches 100% is just about 12.11 V, when it should be close to 12.6. I have replaced the battery there times, swapped chargers, reset SMC, PRAM, etc., and nothing fixes the issue. After about four cycles the newly replaced batteries health drops to the order of 60%. The first time I thought the replacement battery was faulty, but every new replacement battery, even from different vendors (including iFixit) did the same. I believe the trouble lies in the circuit or firmware that determines the maximum safe charge voltage and never lets the batteries reach their peak capacity. Any ideas about how to fix this issue?
The top battery charge voltage on my MacBook when the charge reaches 100% is just about 12.11 V, when it should be close to 12.6. I have replaced the battery there times, swapped chargers, reset SMC, PRAM, etc., and nothing fixes the issue. After about four cycles the newly replaced batteries health drops to the order of 60%. The first time I thought the replacement battery was faulty, but every new replacement battery, even from different vendors (including iFixit) did the same. I believe the trouble lies in the circuit or firmware that determines the maximum safe charge voltage and never lets the batteries reach their peak capacity. Any ideas about how to fix this issue?