Ultrabay battery won't switch to main battery and results in sudden shutdown.

Hi,
I just changed my windows 7 32 bit to 64 but version. The power manager version is 3.66 and driver version 1.64, bios version is LENOVO 7UET93WW (3.23 , 12/15/2011). The ultrabay battery drains to zero and won't switch to main battery, which leads to a sudden shutdown without any warning. In windows 7 32 bit version, I don't have such problem. It's annoying. My computer is T400 7147 CTO.
Thanks!
chicagot400

Hi I have the exact same problem. I have a T400 2764 CTO. Changes I have recently made (past 2 weeks): I upgraded to Windows 7 64, added a PC Card media reader, added an express card USB 3.0, a Samsung 256 GB SSD and the Ultra Bay Battery. Everything was working great... both batteries recognized, ran Lenovo Update... Have everything...
Well the battery meter recognizes both batteries (a 4-cell and a 3-cell), combines their life, but it drains the 3-cell first to ZERO... and isn't bright enough to figure out how to switch before abruptly dropping power to the system.
Hopefully like the ATI switchable graphics that had bugs for ages this battery issue eventually gets fixed. Let me know if you figure out any solution. AND LENOVO, if you are reading, try and set it up so that the 2 battery usage maximizes the life of both batteries with whatever controller you put together.
Thanks.
- Tom

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------Denis - your posting below --------
Lowell
The backup battery of portables is rechargeable, as
opposed to the chuckability of desktop/tower
machines, because its designed function is not solely
to maintain PRAM settings.
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main batteries approach a critical level of
exhaustion, to allow you to 1) swap in a charged main
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you licketty-split across the continent to a
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standard 30mAh). The significance of those figures
is apparent if you compare it with the new capacity
of 1730mAh in a PB500 main battery.
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in a PB160 that had, by best available estimate, not
been in service for 13 years. It was also
characteristic of them that they did not recharge
before the main battery reached full terminal
voltage. (Note: not 'full capacity'.) A main
battery can approach full terminal voltage without
having much capacity to store charge, as most owners
of older PBs know to their sorrow. So the backups
are most easily restored by leaving the powered AC
adapter permanently attached to the PB, at least for
several days.
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