Computer does not put itself to sleep when used in lid-closed mode

Hi. I'm having a small problem when using my macbook pro with the LED display, lid closed and with external keyboard and mouse. If I leave the computer unattended, the display goes to sleep at the time specified in system settings under energy saver. The computer, however, does not go to sleep - the white power indicator remains solid and noises for new email etc can still be heard.
I should probably just try to remember to put it to sleep manually but I keep forgetting. Does anybody know what settings I need to adjust?

I tried cycling the old battery many times, and the computer would still shut down unexpectedly instead of going to sleep when it ran out of power. I got a free replacement from the supplier [http://myworld.ebay.com/cbkusaelectronics>, but I have cycled this new battery twice now, and it still does not go to sleep when it runs out of power. The capacity of the battery is fine (4.9 Ah), and the timing calibration seems fine as well. I have two older batteries from NewerTech and they allow sleep every time, so I think my computer is fine. Can anyone enlighten me about the cause of this problem? Does my battery lack some 'sleep battery' cell in it for use after the other 4 cells discharge? Or does my battery lack a chip that communicates with the computer? Is there any hope of getting this battery to support sleep when discharged?
Has anyone else seen this problem consistently in a brand of battery? Does anyone have a recommendation for a cheaper battery that does not exhibit this problem? I have been happy with NewerTech, but they cost over $130.
(I only paid $44 plus $10 shipping, so I probably got what I paid for. It is maybe still worth it to have a high capacity battery for such a low cost, but I can't rely upon it in those last few minutes or I may lose work.)

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Computer does not put itself to sleep when used in lid-closed mode

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