Satellite C660 - WLAN disconnects on battery power supply

HI
I have a new Satellite C660 which is a great wee machine BUT every time I disconnect the power cable the wireless connection looses the internet connection. Wireless is fine and all settings accurate. I have checked the amended the power settings and they are set to be ok whether on battery or power.
But still I cannot disconnect the power cable without losing the warless connection. The modem is still on and functioning and even more strongly I can access other peoples wireless connections whilst being off line.
Please any ideas?
Thanks

When you use notebook on battery power supply and use FN+F8 can you enable and disable WLAN module properly?
Ave you checked WLAN settings in device manager properties (click here )?

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