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1 New iFixit battery, installed ok but drops charge extremely fast..
Hi All,
Just installed a new iFixit battery into my Mid-2012 15” Unibody MBP.
Also replaced the DC in board and a new Apple 85W MagSafe charger.
The battery is recognised and seems to work fine. However, when running on battery power the battery percentage drops down to around 50% after an hour or so and then all of a sudden it will drop from 50% down to 7% instantly. The computer will run for maybe an hour at 7% then will drop down and eventually shut down at 0%.
I made sure to follow the calibration instructions to the tee, charging to 100% running it on the charger for a few hours then unplugging the charger and draining the battery until the computer shutdown. I then left it overnight with a flat battery and recharged it to 100% the following morning.
I have reset the SMC, reset PRAM. I am also using a new 85W MagSafe adaptor.
Could the battery be faulty?
Thanks in advance,
Luke
Update (04/15/2019)
Thanks for the replies guys, I do get about 3 hours of use from the new battery, It seems to go OK from 100% to around 50% but it just drops from around 50% to 7% within a minute or two, then sits at 7% for about half an hour then I maybe get another half hour of battery life before the computer turns off.
It has taken over 6 hours to charge it up today, much slower than yesterday (full charge in around 3 hours)..
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23 
3 댓글
Just a quick update, iFixit are sending out a replacement battery for me. Sounds as though there is a fault with the current battery.
I have been extremely happy with their support and service.
Hope the replacement battery solves this issue.
Will keep you posted.
Luke Marinovich 의
Widespread issue. I bought batteries from ifixit (for iPhones), and each one of them had issue after very few cycles, sometimes right from the beginning. 80% reported health after 60 cycles, battery dying at 50% in a moderately cold weather (-5), then slowly filling with gas after 100 cycles, pushing the LCD outward. As iPhones do use lots of battery power, hard to tell whether it is a bad battery or simple aging.
On the other hand, Apple-manufactured batteries are overly optimistic about their health: they still report 85% after 500 cycles, but still discharge pretty fast.
pat 의
@pat have you ever contacted iFixit about your experiences? I do know that they actually test all their batteries etc. If there are any issues I think you should notify them so they can take a look at what is going on. https://help.ifixit.com/article/136-emai...
oldturkey03 의