Is my mac battery failing?
I'm wondering if there's a good way to check the health of my battery. Recently my computer has been shutting down spontaneously when on battery power. It used to happen just when I unplugged it from power and started to use it. Now it's happening if I leave it unplugged and asleep (when I try to wake it up it's shut down and I have to reboot it). Sometimes it'll just crash when I'm using it.
The computer is old, it's a Mid-2012 MacBook Pro 15". I've used the system report to check the health of the battery, and while it has a lot of charge cycles, it looks healthy. Here's what it says:
Battery Information:
Model Information:
Manufacturer: SMP
Device Name: bq20z451
Pack Lot Code: 0
PCB Lot Code: 0
Firmware Version: 406
Hardware Revision: 2
Cell Revision: 158
Charge Information:
Charge Remaining (mAh): 5701
Fully Charged: No
Charging: Yes
Full Charge Capacity (mAh): 6201
Health Information:
Cycle Count: 740
Condition: Normal
Battery Installed: Yes
Amperage (mA): 685
Voltage (mV): 12383
System Power Settings:
AC Power:
System Sleep Timer (Minutes): 0
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 10
Wake on AC Change: No
Wake on Clamshell Open: Yes
Wake on LAN: Yes
AutoPowerOff Delay: 14400
AutoPowerOff Enabled: 1
Current Power Source: Yes
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Hibernate Mode: 3
High Standby Delay: 4200
PrioritizeNetworkReachabilityOverSleep: 0
Standby Battery Threshold: 50
Standby Delay: 4200
Standby Enabled: 0
Battery Power:
System Sleep Timer (Minutes): 10
Disk Sleep Timer (Minutes): 10
Display Sleep Timer (Minutes): 2
Wake on AC Change: No
Wake on Clamshell Open: Yes
AutoPowerOff Delay: 14400
AutoPowerOff Enabled: 1
Display Sleep Uses Dim: Yes
GPUSwitch: 2
Hibernate Mode: 3
High Standby Delay: 4200
Reduce Brightness: Yes
Standby Battery Threshold: 50
Standby Delay: 4200
Standby Enabled: 0
Hardware Configuration:
UPS Installed: No
AC Charger Information:
Connected: Yes
ID: 0x0100
Wattage (W): 85
Revision: 0x0000
Family: 0x0085
Charging: Yes
I wouldn't question that the issue is battery related except I recently was messing around with EtreCheck to remove lots of old files the I didn't need anymore and in the process screwed up a bunch of stuff. This was also when the crashing started. However, since then I did a complete reinstall of my OS and while I used time machine to migrate over music, photos and some documents I did fresh installs of everything else, so I don't think anything that I screwed up would have carried over. And the problem has gotten worse with time, which suggests to me that the battery might be failing. I'd just hate to spend the money on a new battery only to find that it wasn't actually the problem. Thanks for your help.
[Personal Information Edited by Moderator]
MacBook Pro 15", macOS 10.14