MacBook turn off without warning

My 4-year-old MacBook start turning off without low power warning while on battery.
I checked the battery level, it's usually around 20~30% once I plug it back on and restart.
Any one have any idea? I got a new battery last summer, and I really don't want to pay for another one.
The following is the information of the battery and my MacBook.
Model Name:          MacBook
Model Identifier:          MacBook2,1
Processor Name:          Intel Core 2 Duo
Processor Speed: 2 GHz
Version 10.4.11
Battery Installed:          Yes
First low level warning:          No
Full Charge Capacity (mAh):          3989
Remaining Capacity (mAh):          1409
Amperage (mA):          1584
Voltage (mV):          12028
Cycle Count:          152

Your battery info doesn't look bad. Have you ever calibrated your battery? This is necessary not so much for the health of the battery, but rather to make sure the battery and your MacBook are in sync. Calibrating your battery is what allows your MacBook to estimate how much of a charge is remaining. Over time, without calibrating, they can become out of sync. When this happens, your computer may think you have a 20% charge, when the battery only has a 1 or 2 percent charge. Since your computer "thinks" it has plenty of charge remaining, it doesn't alert you or go into sleep... but then the battery just runs out. Here are the instructions for calibrating your battery:
http://support.apple.com/kb/ht1490
You might want to reset your SMC first as this is a fairly quick process and see if that resolves your problem first (although you should still calibrate your battery if you haven't done so):
http://support.apple.com/kb/ht3964

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Message was edited by: Vegabondsx
Message was edited by: Vegabondsx

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MacBook turn off without warning

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