New iFixit battery, installed ok but drops charge extremely fast..
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,
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)..