Why does the battery die before the power monitor puts the computer to sleep?

Used to be that the power monitor would sleep the computer safely, but lately that doesn't work. I imagine this is something to do with ageing of the battery - is there a way I can recalibrate this?
Thanks!

Well, that explains why I thought it wasn't very useful. Let's try this:
Model Information:
Manufacturer:          NewerTech
Device Name:          ASMB013
Pack Lot Code:          1
PCB Lot Code:          21
Firmware Version:          10
Hardware Revision:          001f
Cell Revision:          200
Charge Information:
Charge Remaining (mAh):          4687
Fully Charged:          Yes
Charging:          No
Full Charge Capacity (mAh):          4687
Health Information:
Cycle Count:          218
Condition:          Normal
Battery Installed:          Yes
Amperage (mA):          0
Voltage (mV):          12515

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Why does the battery die before the power monitor puts the computer to sleep?

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