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I have had a new battery in my mid 2012 15" macbook pro running 10.11.6

The battery health as monitored through a battery health app downloaded from the mac app store has been deteriorating ever since i installed it and after about 3 months the battery is saying "Service Battery"

This doesn't tell the full picture though, as if it use my Mac once i get the "low battery 9 minutes remaining" warning, it will go on for hours without cutting out.

Ive been told i need to do an SMC reset to address the issue, but each time i do it following Apples guides for laptops with a removable battery, it dosnt fix anything?

How can I know that an SMC reset has taken place, can it be seen in the logs ? Or can i do an SMC reset through some kind of GUI tool which will give me feedback instead of the standard way which i cant be sure has worked.

Here is an output from About this mac > System Info > Power

Model Information:
 Serial Number: REDACTED
 Manufacturer: SMP
 Device Name: REDACTED
 Pack Lot Code: 0
 PCB Lot Code: 0
 Firmware Version: 2
 Hardware Revision: 00aa
 Cell Revision: 2
 Charge Information:
 Charge Remaining (mAh): 220
 Fully Charged: No
 Charging: No
 Full Charge Capacity (mAh): 3918
 Health Information:
 Cycle Count: 81
 Condition: Service Battery
 Battery Installed: Yes
 Amperage (mA): -1943
 Voltage (mV): 10877

System Power Settings:

 AC Power:
 System Sleep Timer (Minutes): 3
 Disk Sleep Timer (Minutes): 0
 Display Sleep Timer (Minutes): 3
 Wake on AC Change: No
 Wake on Clamshell Open: Yes
 Wake on LAN: Yes
 AutoPowerOff Delay: 14400
 AutoPowerOff Enabled: 1
 Display Sleep Uses Dim: Yes
 GPUSwitch: 2
 Hibernate Mode: 3
 PrioritizeNetworkReachabilityOverSleep: 0
 Standby Delay: 4200
 Standby Enabled: 0
 Battery Power:
 System Sleep Timer (Minutes): 10
 Disk Sleep Timer (Minutes): 0
 Display Sleep Timer (Minutes): 2
 Wake on AC Change: No
 Wake on Clamshell Open: Yes
 AutoPowerOff Delay: 14400
 AutoPowerOff Enabled: 1
 Current Power Source: Yes
 Display Sleep Uses Dim: Yes
 GPUSwitch: 2
 Hibernate Mode: 3
 Reduce Brightness: Yes
 Standby Delay: 4200
 Standby Enabled: 0

Here is an output from the command system_profiler SPPowerDataType | grep -i "charge information" -A 10

Charge Information:
 Charge Remaining (mAh): 234
 Fully Charged: No
 Charging: No
 Full Charge Capacity (mAh): 3918
 Health Information:
 Cycle Count: 81
 Condition: Service Battery
 Battery Installed: Yes
 Amperage (mA): -2579
 Voltage (mV): 10890

Battery status is best read in the About this Mac.

Paste that information here.

There is a way to see if SMC reset worked.

While doing it, watch the MagSafe plug light, it will briefly change color if the reset was successful.

UPDATE:

Your battery is in bad shape.

New battery has capacity of 8000 mAh. Ower the life that numbers goes gradually down.

Your is already down to 50% Full Charge Capacity (mAh): 3918 means it can not hold the charged (due to internal leakage).

What ever battery you installed 3 Months ago is not working, so get it replaced.

It looks like you got a old battery.

Something is spooky with your battery report.

This is what it looks on my MBA 2017.

Manufacturer: SMP
 Device Name: bq20z451
 Pack Lot Code: 0
 PCB Lot Code: 0
 Firmware Version: 511
 Hardware Revision: 000a
 Cell Revision: 1200

Why does your hides the information (or was it you) that did that ?

Model Information:
 Serial Number: REDACTED
 Manufacturer: SMP
 Device Name: REDACTED

It's quite possible you have a defective battery. From the output you posted, here's what we know.

• The battery reports a full charge capacity of approx. 4Ah (4 Amp hours)


• The SMC measures that you have 234 mAh (mili-amp hours) remaining


• It's showing a draw of approximately 2.5A (battery is being drained)

The SMC can only calculate how much battery capacity is left by measuring the current power against the current draw and known full capacity. In this case, it's measuring that you're out of power and indicating your battery needs to be serviced.

There's no "dipstick" that can give you the actual charge, the SMC must calculate it and from the data it's getting from the battery, it thinks it's failing even though it continues to work.

Your best bet is to replace the battery (it's probably still under warranty)