Ga door naar hoofdinhoud

Released June 2012 / Core i7 processor with Turbo Boost / Up to 1 GB DDR5 Video RAM

588 Vragen Bekijk alle

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,


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)..

Beantwoord deze vraag Dit probleem heb ik ook

Is dit een goede vraag?

Score 5


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.


Voeg een opmerking toe

1 Antwoord

Het nuttigste antwoord

sounds like you might have a faulty battery.

Best app you can use to get a reading of the battery health is ‘Coconut Battery’

get a screen grab of the test screen on that app, then email them direct.

I’ve seen quite a few replacement (non-apple) batteries have issues like this, and it is nearly always a fault with the battery.

In some cases, the battery shows a full charge capacity of over 60,000 (which is physically impossible), and it powers off after a few minutes on without mains plugged in.

OWC batteries have this issue from what i’ve seen, as we sell a lot of them.

Was dit antwoord nuttig?

Score 4


@thebookyard - Jon, this is a QC issue at the battery factory. There seems to be a rash of bad batteries from many different sellers. Another case of Apple not offering parts directly.


Voeg een opmerking toe

Voeg je antwoord toe

Luke Marinovich zal eeuwig dankbaar zijn.

Afgelopen 24 uren: 1

Afgelopen 7 dagen: 3

Afgelopen 30 dagen: 7

Altijd: 337