Why did my 2012 MBP perform much worse without a battery?

Grandesigns

macrumors newbie
Original poster
May 28, 2020
3
0
I recently spent a week or so using my Mid-2012 i7 MBP without a battery installed, and found that its overall performance during that span was much slower than I am accustomed to. My working theory is that the system has power need "spikes" that are more than the power adaptor can handle without the battery to act as a buffer, so the MBP was throttling itself to stay within the available power envelope.

Does anyone know if that's right? Any other theories?
 

Honza1

macrumors 6502a
Nov 30, 2013
545
204
US
This is known fact. To prevent brownouts, Mac notebooks without battery will slow down to reduce power consumption. Battery is used under normal conditions to supplement power source as needed.
 

Mohanak

macrumors newbie
Nov 1, 2018
10
3
why not the case with iMac?

apple doesn't want a MacBook to get much life.
mid-14 15" macbook: battery is 95-watt but the power supply unit is 85-watt.
2019 16" MacBook pro: battery is 100-watt output. but the PSU is 96-watt.

i don't think post-2010 models could run without battery. in cases like disconnecting swollen battery for safety.

they don't WANT macbook to run good on power.

forget about sudden cable disconnect. it's not a problem. this is a user issue.
forget about power assumption excuses. it's happening with battery already.

older mid-2000s macs and PCs run well on AC-DC power adapter cables
but not for the recent models.
 

matram

macrumors 6502a
Sep 18, 2011
538
242
Sweden
apple doesn't want a MacBook to get much life.
mid-14 15" macbook: battery is 95-watt but the power supply unit is 85-watt.
2019 16" MacBook pro: battery is 100-watt output. but the PSU is 96-watt.
The 2019 battery is 100 WattHour, this is a measurement of Energy, not Power.
 
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