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Ifixit replacement battery 98% new, 95% after one week?

So my Macbook Pro battery was going completely dead under load at 65% when I opened FCPX, just loading the program drew too much power, also Apple batt indicated “service battery”. Bought the ifixit battery replacement kit for $110, spent the 3 hours replacing the battery, and did the calibration process. Charge up to green LED, contoinue charging 2 more hours, remove charger, turn on, let it run down on its own, then leave to shut down, then 5 hours, then charge back to full. Capacity read only 98% after that initial calibration. Computer would get to around 50%, then instant drop to 7%. That is like 4000mah indicated on Coconut down to 700mah instantly. After it completed that 1st calibration, a few days passed, I ran a 2nd calibration, and the results were the same, 98% capacity, and that weird drop from 50ish% down to 7%. Few more days pass, it’s this morning, I am charged up +2hrs, unplugged, and in the proces of running down the battery again…only that initial chargup coconut battery says the ifixit battery only has 95% (8300mah of 8755mah design) capacity with 7 charges. I bought this new battery to sell my Macbook, but how will a buyer respond when I tell them it has a new battery but they see 95% full capacity and that drop to 7%. Is this battery bad? I would hate to have to return and redo a 3 hour replacement process again. I should mention I also reset the SMC a few days ago hoping that would clear whatever was causing the battery reading issues, but no dice. :(

Paul

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Still discharging, it was at 35%, I opened activity monitor and INSTANTLY, it went from 35% to that dreaded 7% 558mah! Making things worse, the design capacity has also dropped instantly from 95% 8300mah to 92% 8000mah and says 8 charges!

WTH

Paul

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Now 1 hour later, still saying 7% with 500mah remaining. Is it possible for the little computer chip or controller on the ifixit battery to be defective, and not the battery cells themselves? My battery drain mechanism is simply leaving my Chrome browser open and brightness at 50%.

Paul

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Now on my 11th cycle, coconutbattery says I am down to 86% of designed capacity at full charge...was 89% at 10th cycle, and 92% at 8th. ifixit sent a replacement battery right away, and I will try to install the replcement replacement this weekend. I wonder how sticky the ifixit battery glue is compared to Apple...maybe I can just pry it out without full logic board removal?

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Afer 12 charge cycles, my ifixit replacement battery was down to 83% capacity at full charge, losing like 3% capacity every cycle. Ififix sent a free replacement, which because I didn’t squeeze the last replacement down too hard, was able to be swapped out with tugging and no need to spend 3 hours removing and replacing the logic board. Charged the new one up, it was 8900mah vs 8300mah for the first one, and after the calibration, the replacement is holding at 8900mah. Thank you ifixit! :-)

I did not remove the stickers from the glue this time, in case I needed to swap again…any problem running the battery unglued? I see the flat cable runs across it, I hope the weight of the battery won’t hurt that when flipped right side up. :-\

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No seller is immune from battery failures, we had just a couple of days back someone on the forum with an almost new Mac with battery issues asking for help. The only difference between sellers is after sales support, but other than that, battery manufacturers for Macs are just a handful in the whole world. I don’t see any other way but contacting customer support for a replacement.

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Yeah, the cells seem to be powering through the hours fine, it's just that very odd mah and % readings. I was hoping someone might have a magic reset procedure that would make it all better. If this 3rd calibration attempt still doesn't work, I guess I need to get an RMA and set aside 3 hours next week to replace th ebatery again. :(

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@Paul Anderegg I've had and read a number of such issues already..in my opinion it's getting worse too as of late. Use it and use it for some time, don't bother about calibration..sometimes they get better on their own, most times they don't. You're covered with a warranty from a serious seller and it doesn't make a difference for them..they'll have to return it anyway, so keep it at work for some time.

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Paul Anderegg さん、ありがとうございました!
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