I have a late-2013 MacBook Pro 15" which still has the original battery. It's at 1,144 charging cycles, and a few days ago the battery health was at about 50%, though since then it plunged to 4%.
The output of
pmset -g batt:
Now drawing from 'AC Power' -InternalBattery-0 (id=xxxxxxx) 100%; charged; 0:00 remaining (Poor/Good) failure: "Permanent Battery Failure" present: true
(Just yesterday, the output was the same except for
failure: "Fuse Blown".)
The output from System Information:
Battery Information: Model Information: Serial Number: [redacted] Manufacturer: SMP Device Name: bq20z451 Pack Lot Code: 0 PCB Lot Code: 0 Firmware Version: 702 Hardware Revision: 1 Cell Revision: 1206 Charge Information: Charge Remaining (mAh): 308 Fully Charged: Yes Charging: No Full Charge Capacity (mAh): 319 Health Information: Cycle Count: 1144 Condition: Replace Now Battery Installed: Yes Amperage (mA): 0 Voltage (mV): 11090
The battery/power icon on the menu bar also indicates
Condition: Replace Now.
According to a series of other posts (1, 2, 3, 4, 5), when the battery is detected as dead or removed, the CPU is throttled to its slowest possible speed. This is what happened to me two days ago: after a restart (due to taking out the power adapter a few seconds before closing the lid), the computer was running very very slowly and iStat Menus was always showing a CPU clock speed of 800 MHz.
Now, I understand the battery is shot and needs replacing, and I have ordered a new one, but it won't arrive overnight. I need to keep using the laptop in the meanwhile as it is the only computer I have. It's really painful to work with the CPU permanently throttled to 800 MHz, and I'm looking for a temporary fix.
As I understood from other answers, this might be impossible, but funnily enough, I was fiddling around with this yesterday, and at some point, the computer suddenly felt snappy again (this happened at about the same time I was using
pmset to change
hibernatemode from 3 to 25, but it's probably not related). Checking iStat Menus, the CPU was no longer being throttled. This is exactly what I needed to hold out for the period until the battery arrives.
Unfortunately, this morning the laptop rebooted again. This is despite the fact that I closed the lid on the computer, waited until the fans stopped, and only then took out the power adapter, but still, when I connected the power adapter again and opened the lid, it had rebooted. Now the CPU is stuck at 800 MHz again and the computer is again unusable.
My question is: since it came out of throttling once (although I'm not sure what happened, or what I did, that was responsible), is there anything I can do to make it come out of throttling again?