There have been many messages and comments posted on the forum regarding using
various 3rd party batteries to enhance the battery operation time of the T1000
and other Toshiba Laptops.
I have  personally tried the two of these that seem to have generated the most
interest and message activity, and I thought that perhaps some of you might be
interested in seeing how they each compared with the original T1000 batteries.
In  all  cases,  my  battery  life  tests  were  performed under the following
conditions:  I first charged the T1000 with the unit turned off for a  full 24
hours (to  ensure that  it had  a good,  full charge!)   I  then unplugged the
charger, turned the computer on, and booted it  up (from  ROM -  hence NO disk
access)   and then  I watched  the computer  like a  hawk to note when the Low
Battery warning light comes on.  I noted the time from turn-on  to Low Battery
(RED  LIGHT)  but  left  the  computer running (continuously writing a file to
"hard ram" so I could tell exactly when the computer actually shut  off due to
low power  shut-down by  the date/time  stamp on the saved file) and noted the
final OFF time.
Please note that in these tests I ran the computer  continuously, but  with NO
disk access.  If you typically operate using mostly "hard ram" (Toshiba's 768K
RAM expansion used as a ram disk) you will get  similar results  in real-world
battery operating time.  The more you use the floppy disk drive, the more this
battery operating time will be reduced accordingly (the spinning motor  of the
disk  drive  uses  about  the  same  amount  of power as the whole rest of the
computer!)  Also, please keep in mind that  if you  have the  Toshiba internal
modem (or the Holmes internal modem, or some others) installed, this will also
decrease your battery time EVEN IF THE MODEM IS TURNED OFF, as these units are
configured such  that they  ALWAYS draw power - EVEN IF THE COMPUTER IS TURNED
OFF!  In my T1000 I have a Product R&D internal modem installed, which has its
own individual  power switch so that you can turn it off and when off it draws
NO power from the laptops battery ... just don't forget  to turn  it off after
you complete your on-line sessions!  For my tests, the modem was left OFF, and
the "768 card" was installed.

              --------------------------------------------------------------
              | TOSHIBA BATTERIES | PERIPHEX BATTERIES | OVONICS BATTERIES |
  ------------|-------------------|--------------------|-------------------|
  |  TIME TO  |                   |                    |                   |
  |    RED    |    4 Hr.  3 Min.  |    5 Hr. 31 Min.   |   7 Hr. 10 Min.   |
  |   LIGHT   |                   |                    |                   |
  |-----------|-------------------|--------------------|-------------------|
  |  TIME TO  |                   |                    |                   |
  |   POWER   |    4 Hr. 47 Min.  |    7 Hr.  9 Min.   |   9 Hr. 37 Min.   |
  |    OFF    |                   |                    |                   |
  |-----------|-------------------|--------------------|-------------------|
  |   COST    |      Supplied     |        $ 27        |       $ 40        |
  --------------------------------------------------------------------------

NOTE: Toshiba's standard batteries are "sub-C" size (1300 mAH) Nickel Cadmium.
      Periphex batteries are "C" size (2000 mAH) high capacity Nickel Cadmium.
      Ovonics batteries are "C" size (3500 mAH) Nickel Hydride.
Nickel Hydride cells offer the additional advantage that they are  not subject
to the  "memory effect"  that can occur in traditional NiCad batteries if they
are repeatedly discharged to the same partially depleted level.

RESULTS:  Judge for yourself,  and pick whatever suits your personal needs and
          finances!  I was VERY happy with the periphex batteries, but because
          of my  extensive  needs for battery operation,  I decided to try the
          higher  capacity  Ovonics  cells ...  and  I  like them even better!
          Because of the Ovonics cells being  impervious  to  memory  effects,
          you do not need to periodically  deep-discharge them,  and you never
          have to "worry" about repeated  short-term use of the laptop causing
          a NiCad type memory problem.   They cost a bit more,  but  they  are
          probably the best value for the money,  and  you  will have a lot of
          fun impressing your  laptop-using friends,  bragging about the truly
          unbelievable battery life of your laptop!
                                                     - John Rehak  76327,444