My computer shuts off suddenly w/o warning

Hi - I recently upgraded my older white Mac to Lion system and a week or so ago put in a new battery. The instructions for the battery were to put the energy saver/sleep on "never" until the battery completely ran down the first time. After the computer shut off suddenly without the usual "your battery is low" warning, I remembered to put it back on energy saver mode but it's still shutting off w/o warning if I don't keep an eye on it and plug it in before it dies. Any ideas what might be causing this?

Hi Sharusz,
If you are having unusual power/battery issues that are leading to sudden unannounced shutdowns, you may want to try resetting the System Management Controller (SMC). You may find the following article helpful:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
You may also want to try re-calibrating the battery again, just in case the charge status is being misreported to the computer:
OS X Lion: Calibrate the battery in a portable computer
http://support.apple.com/kb/PH4230
Regards,
- Brenden

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