macbook pro battery health issue

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Jun 6, 2008
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I have a mid2012 macbook pro 15" which battery health keeps changing randomly: 33%, 37%, 75%, 85%, 82%, back to 37%.
I have reseted the PRAM and the SMC many times but the issue is still there.
I started having this issue when I downgraded from Yosemite to Mavericks. so, i thought that Mavericks is the problem then I reverted back to Yosemite but the battery is still behaving weird.
I hope someone can help me fix it. Thx in advance
 

chscag

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Jan 23, 2008
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Location
Keller, Texas
Your Mac's Specs
2017 27" iMac, 10.5" iPad Pro, iPhone 8, iPhone 11, iPhone 12 Mini, Numerous iPods, Monterey
How many cycles does the battery have on it? And what does coconutBattery have to say about the condition of the battery?
 

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