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I have a Macbook Pro 13" i7 Early 2011 (MacbookPro8,1). It's on its second battery (DP bq20z451 manufactured Dec 2012) from March 2015. It was working fine for a while, but in the last month it's developed a problem and it's getting increasingly worse.

Sometimes even if the AC charger indicates it's charging (orange light), but the OS will say it is discharging. coconutBattery agrees.

Sometimes the battery will indicate it's charging, but when I remove the AC power it turns out it was not; the battery charge level will drop. If this goes on long enough the laptop will power off because the battery has gone dead but the OS thought it was at 100%. In this case, the lights on the battery agree it is out of power.

coconutBattery says the battery is in good condition, has 93% of its capacity, has only gone through 317 cycles, and is not overheating (30ºC).

My question is, is replacing the battery likely to fix this problem? Or is this indicative of a more serious problem?

Things I have tried:

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    Sounds to me like what ever it is, the only thing left to do is to send it to be repaired, since you've already tried different power adapters. – Joonas Jan 15 '16 at 8:36
  • I can replace the battery on my own. – Schwern Jan 15 '16 at 20:20
  • Admittely a long shot, but sometimes the magsafe connector on the macbook side dirties up; often with small magnetic debris. Try to clean it up with a cotton bud and a toothpick. Worked for me once or twice. – EDP Feb 17 '16 at 17:00
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    Or try to find another charger which you can try out. Perhaps it's partially fried. It is a 5 years charger after all... – EDP Feb 17 '16 at 17:01
  • Safety tip: if there is a possibility that your new battery has failed, do not leave it charging unattended or overnight. There is a risk that one of the cells in the battery has failed and will overheat causing it to swell or rupture or damage the other cells by the excess heat and pressure. – Mic Channel Feb 17 '16 at 19:09
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I finally fixed it today. It turns out the Magsafe DC-in board can be replaced. It's a little $25 part ($15 refurbished). I followed the instructions on iFixit.com; you have to take apart practically the whole laptop which includes a lot of tiny, tiny connectors, but it's doable with just a few screwdrivers and a spudger I made from a chopstick.

Macsafe DC-in board

The battery now charges fine, and the laptop doesn't get nearly as hot (that could also be because I cleaned the heat sink).

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