Why is my battery not detected?

EliteBook 8460p Notebook PC running Win7 Pro 64 doesn't detect battery.  Boots and runs perfectly normal with ac power, but immediately shuts off (not shuts down... off!) when ac power disconnected.  Also, when trying to flash BIOS update, ac power is somehow not detected.  Help if you hae any ideas.
Thanks!

Turning off when you remove the ac power could likely be just a dead battery. How old is the battery? What concerns me more is that a BIOS flash will not detect that an AC adapter is connected. So it senses that the laptop is running on battery? What does the Windows power icon say (lower right corner)? Does it detect battery or say the battery is charging?

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