I would not advise a bios update w/out the battery and psu.If you do not want to fork over that much for a battery go to ebay you can get genuine dell batteries for $50-$75.You can do a bios update with a flash drive,some people have done it w/out the battery this way but not recomended.Unless the bios has an added feature you require or fixes problems you have now (if it aint broke dont fix it) do not do it.A bad bios flash will render your laptop a paper weight.
E1705 T7400 2.16Ghz / Vista Home Premium SP2 / 17" LG WUXGA 1920 X 1200 / 4GB 667Mhz Geil Ram w/Heatspreaders / Western Digital Scorpio Black 500GB 7200RPM / 500GB 7200RPM My Book / Nvidia Geforce Go 7900GS 256MB / Toshiba DVD/CD+/-RW DL / Intel 4965 A/B/G/N / 355 Bluetooth 2.0+EDR / Pinnacle Pro HDTV USB Tuner / Pinnacle Ultimate HDTV USB Tuner / Sound Blaster Audigy Advanced MB / Sound Blaster X-Fi Extreme Audio Notebook / Logitech G51 Surround Sound Speakers / 2-NB-MA01 Notebook Coolers / 3D Mark06 5446 / Driver v.174.31 /
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XPS Gen 4 Desktop>being rebuilt
I agree with bacillus
I have done a number of flashes without the battery and no problems. Just do not do it in the middle of Lightning storms where a power failure is possible/probable or kick the AC cord loose in mid-flash as I did once. Luckily that was with the battery installed.LOL