Please help! Macbook pro randomly turning off when not plugged in, have new battery

[danabean]

Hi,
I have a late 2008 (2009?) Macbook Pro that I bought used. It worked fine hte first year, but the battery slowly started getting worse and worse, until it would only last unplugged for maybe an hour before it got drained. So I purchased a new battery.

I installed the battery without any problems and the 'Service Battery' message is gone. The battery says normal, see below.

If I unplug the charger, the macbook will keep working, nothing weird happens. But usually after 20 mins or half an hour, it will just turn off with NO warning. There is no warning for low battery either if it happens to get down near 10-15%, just black screen. Laptop starts just fine once plugged back into the wall. The time it takes to turn off varies.

WHY IS THIS HAPPENING? WHAT can I do to fix it? This is a brand new battery.

Battery Information:

Model Information:
Manufacturer: SMP
Device Name: bq20z95
Pack Lot Code: 0
PCB Lot Code: 0
Firmware Version: 0
Hardware Revision: 0
Cell Revision: 0
Charge Information:
Charge Remaining (mAh): 2100
Fully Charged: No
Charging: Yes
Full Charge Capacity (mAh): 4133
Health Information:
Cycle Count: 29
Condition: Normal
Battery Installed: Yes
Amperage (mA): 2163
Voltage (mV): 11769

 

[GGJstudios]

If I unplug the charger, the macbook will keep working, nothing weird happens. But usually after 20 mins or half an hour, it will just turn off with NO warning.

Have you calibrated your battery? Instructions for doing so are in the CALIBRATION section of the Battery FAQ linked below.

You could also try resetting the SMC.

Hopefully, you bought a genuine Apple battery. I wouldn't trust or recommend any non-Apple battery, due to the number of problems reported with "knockoff" batteries. Also, there is no assurance that knockoff batteries have the same charging technology that Apple uses, involving the battery, the MagSafe adapter and the Mac's logic board.

The link below should answer most, if not all, of your battery/charging questions. If you haven't already done so, I highly recommend you take the time to read it.

Apple Notebook Battery FAQ​

 

[danabean]

Thank you. I will try calibrating and resetting the SMC and re-post later on if there has been a difference in performance

 

[GGJstudios]

Thank you. I will try calibrating and resetting the SMC and re-post later on if there has been a difference in performance

On models with removable batteries, you should be calibrating every month or two.

 

[tonupi]

hallo,
i have a similar issue,
but when the mac power off, i have to push twice the the power button, to switch on the mac on.
aftrer the first push i see the light power flash once.

does this happen also to you?

thank you

 

[danabean]

There is a problem with calibrating...it says to run down the battery after charging until it's at a very low level...but THIS is the problem. It will never make it that long, because it will have turned of once or more during that time before it can make it down to 10%..........
so how am I supposed to calibrate then.....

 

[GGJstudios]

There is a problem with calibrating...it says to run down the battery after charging until it's at a very low level...but THIS is the problem. It will never make it that long, because it will have turned of once or more during that time before it can make it down to 10%..........
so how am I supposed to calibrate then.....

Just let it run on battery until it powers off, regardless of the percentage. Then leave it on battery for at least 5 hours more before you plug in again.