Model A1286. Released February 2011 / 2.0, 2.2, or 2.3 GHz Quad-core Intel Core i7 Processor

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MacBook battery charges with low wattage

I’ve been using my early 2011 MBP for a while since I got a new ssd and battery for it about 2 weeks ago, and its frigging fast. One problem that I noticed right away was that when it was discharging from full, the percentage would plummet and hang around the 2%-7% range for about an hour. But I attributed that to it being brand new and let it go through a few charge cycles.

The main problem is that it charges super slow. From 0%, charge current was about 3.2 Amps at about 40 watts, which was expected. But as it charged up to 20% it started to taper off to 2 amps at around 26 watts. And it kept going lower from there to 14 watts at 30%. I don’t know why, but when I unplugged the charger and plugged it back in, it jumped back up to 26 watts and holding steady around there. Still not 40 watts but it’ll charge faster. I don’t know if this is like a “break-in” process or something is wrong with my battery or logic board.

I’ve already tried cleaning out the MagSafe connector on both ends, resetting the smc, hitting the pram, reseated the battery twice, and using a UPS. I also tested the MagSafe charger on a 13” MacBook and it charged with 30 watts all the way up to 80%. And just for the record I am using the 85w brick, which is in pretty good shape. Sorry for the wall of text, but hopefully I can find some answers here.

Edit:

Dropped from 39% to 2% before I could get coconut battery open.

Screenshots of coconutbattery not connected:

Block Image

Coconutbattery connected:

Block Image

Edit 2:

To be honest I don’t think there’s really a fix for this problem. There was another thread on this here: Slow charging and sudden battery life loss

There were a few people in there that are experiencing the same problem I am, even across multiple batteries. I think if I were to ask for an exchange I would only run into the same problems. All across the same time frame. I’m just going to deal with it and hope that it sorts itself out.

Edit 3:

I believe that I’ve eliminated enough variables to conclude that the battery is indeed at fault. The charger works correctly, there’s no junk in the battery connector or MagSafe connector, the smc reset had no effect, and a software update had no effect. I saw that my 2009 13” MacBook had the same battery connector that this 2011 one did, so I switched them. Even though that 2009 battery was a 60 wh battery, it still took more power even at a higher charge level, and the fixit battery struggled to pull even 7 watts at 70%. I don’t know why this battery behaves this way, but I’m going to put as much use on it as I can, I hope it evens itself out.

Answer this question I have this problem too

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2 Answers

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Let’s do some testing of the battery. Complete the guide below; upload 2 screenshots to your existing question, one with the MagSafe charger in and one with the MagSafe charger out.

How to Test a Mac Laptop's Battery

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I’ll post the pictures when I get home, had to leave when I posted this.

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@jake0210 Sounds like a plan, keep us updated!

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yep - I had Apple battery about 90% (HIGH) capacity - low about 50 cycles - but it was holding about 15 minutes - why?! Coconut says Manufactured in.... 2008!!!!

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@jake0210 Thats certainly a red flag. You may have bought a counterfeit or a poorly manufactured battery then. Where did you get this battery from?

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@ajcooke01 I bought it directly from ifixit.

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I'd say it's a bit too early to call for a logic board failure at this stage, especially considering the outcome of th preliminary diagnostics. It's a possibility, no more than that, a battery replacement might solve the problem on its own, no need to call for the worst IMO.

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Considering that the first battery I got has a hard time charging fast, I don't know that asking for a replacement would solve anything. I'm not completely closed to the possibility though. I'm going to keep my patience with it and see if there's any improvement, and put as much use onto it as I can. At least 1 charge cycle per day. I'll keep the updates going.

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@jake0210 There might be two different issues in question, a faulty battery or a faulty charging circuit. However a faulty charging circuit would have a "regular" difficulty in charging with any battery, but would not influence battery behavior, sudden drops in charge, etc..

Despite their efforts in supplying good quality spares iFixit might get their share of faulty spares from their supplier..maybe allow for a few more charging cycles as you plan, but if things don't settle contact their customer service. In the end, you better help them and yourself to get faulty items back to the manufacturers for replacement if they don't work as planned.

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@arbaman I’ve already switched the battery out with a different one , it may have not been the right one, but it still charged with a higher power draw. Again like I said, going to get as many charge cycles as I can before I return it.

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Jacob Enderle will be eternally grateful.
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