Why don't I get a battery low warning anymore, laptop just turns off?

My laptop is only just over a year old and I no longer get a battery low warning message. My computer just switches off. Have I disabled the warning somehow?
The battery lasts for about an hour and a half which isn't great. This is what System Profiler says about it:
Model Information:
Serial Number: SMP-bq20z951-3a6c-fac
Manufacturer: SMP
Device name: bq20z951
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 002a
Hardware Revision: 000a
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 1427
Fully charged: No
Charging: No
Full charge capacity (mAh): 3751
Health Information:
Cycle count: 339
Condition: Good
Battery Installed: Yes
Amperage (mA): -1921
Voltage (mV): 10690
Any suggestions would be appreciated. Thanks.

You have the removable battery? In that case, you can expect it to have up to 80% of original capacity at 300 cycles. You have 390 cycles, and it's probably got less than 80% capacity if it only lasts 1 1/2 hour. It's very likely just at the end of its useful life. If you go to an Apple Store, they can stress test it for you, and very likely you will be told you need a new one.
Coconut Battery will show you the current battery capacity vs. the original battery capacity. Mine has 88% capacity after 259 cycles, but the last time I tried to calibrate it, my Mac shut off instead of going to sleep, although I did get the warning. I don't know if you can really calibrate it if it shuts down suddenly. The health on mine didn't change after the last shutdown.
Good luck!

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