Hi Everyone,
As promised, here is my report (a bit late……sorry) on how the NuPower replacement battery is working for me.
When I received the battery in April it had one charge cycle on it and it’s manufacture date was August 14, 2017, in other words it was 8 months old when I received it.
Full charge capacity reported as being: 9008 mAh, with a design capacity of: 8800 mAh.
I performed a calibration and this added another charge cycle.
I wanted to see how long it would last and I ran it down to 9 % charge remaining, at which point I was at a total of 4 hours and 35 minutes of use. I therefore estimated a total usage of 4 hours and 45 minutes (this time was further validated by the data I collected over 3 months). This of course added another charge cycle and also dropped the capacity slightly, down to 9007 mAh.
Please note: I do not use my Mac like this on a regular basis. I use it when I need to and otherwise have it plugged in.
At the beginning of May I used it to 27 % charge remaining and for whatever reason it dropped the capacity to 8995 mAh, I was hoping that this was not going to be a continuing downward trend in total battery capacity. But, a couple of weeks after that I ran it down to 5 % charge remaining, which added another charge cycle, but the capacity increased to 9002 mAh.
Since then things seemed to have settled down and there have no more fluctuations in total capacity. Currently I am sitting at a total of 4 charge cycles with a charge capacity of 9002 mAh. This has not changed since May and everything just seems to be rock solid at this point.
Testing: I tracked my usage time versus battery consumed throughout every day for 3 months. I averaged the data for the 3 month test period and it worked out to 4.77 hours or 4 hours 46 minutes total battery time. This fits bang on with my observed actual usage. Of course, this will fluctuate on a day to day basis depending on how you are using your Mac.
Is this as good as a genuine Apple battery - NO.
It is a GOOD battery and at the 6 month point it is behaving very solidly, let us hope this continues.
I hope you find this useful.
Edit: Saturday October 13, 2018. There has been a drastic change in battery performance over the last two weeks, my MBP was using 42 % of the battery in one hour. I performed SMC and NVRAM/PRAM reset and another battery calibration. This fixed the issue and battery performance is now improved, in the first hour of use after the calibration it used 16 % of the battery.
Edit: Saturday April 27, 2019. Battery performance remained good until January, then I noticed that the total usage was dropping again and is now approximately 4 hours. I am not tracking this as closely as I was, it is now just casual observation.
I would like to do another SMC, NVRAM/PRAM reset and battery calibration as I think that would gain back some battery performance (or more like, reset how my Mac uses the power), but, I have a 2011 MBP and the GPU failed before Christmas. The whole thing was flakey for a couple of months but it has finally settled down and is working well (for now), so I am a little reluctant to try the reset and calibration.
The battery itself is in good shape (no bulging) and is not losing capacity and it is still over design.
Full Charge Capacity: 8991 mAh
Design Capacity: 8800 mAh
Cycle Count: 7
