Craig wrote:
> Kevin McCoy wrote:
> 
>>luth-astro{at}earthlink.net wrote:
>>
>>
>>>IBM instructions for doing a BIOS upgrade on my ThinkPad 770E say I must
>>>have both a fully charged battery and an AC connection in order to do
>>>the upgrade.  Anybody know why?
>>
>>Just the battery is probably good enough, but the house power 
>>requirement might relate to battery management stuff that BIOS does. It 
>>is going to "lose its mind" during the reflash, so bad
things might 
>>happen to power management during the upgrade.
> 
> 
> I believe that a battery is required because the "path" is
from the AC 
> socket, through the DC converter, through the battery, into the 
> computer.  I don't think Thinkpads run without a battery yet plugged 
> into the wall.

Hmm, the T series Thinkpad I have (P2 266Mhz) is running quite happily 
for many months without a battery in it.  Newer models may have this 
path, but this one doesn't.

The issue with requiring the battery in the machine is that these 
batteries will develop severe memory if these are constantly plugged 
into poer (i.e. desktop replacement)  I discovered this with my Thnkpad, 
and destroyed a battery.  That's why it sits without a battery in it.  I 
alos have a Dell Latitude 2.0Ghz machine.  I pulled the battery from it 
before I ever plugged in power.  It is also humming along merrily 
without a battery in its battery bay.



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Houston, TX

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