Hi.
        I don't know, but can tell you some way of thinking:
        -I suppose that what is needed is something greater than 2V, since
it is common that the memory retention voltage of many components is
specified at 2V. So it is common to use a 3.1V battery, or one with
three NiCd elements (the mobo manufacturer will look for the cheapest
component).
        -You should look at the CMOS chip, and look at its specs; there
is the final answer. Probably it will admit up to 5V or more.
        -It should not be difficult to put an external 3V source, but
if not changing mobo circuitry, if the original battery was rechargeable
you should put something rechargeable (or non rechargeable and a diode),
and viceversa.

>
> I'm working on a Compaq motherboard with a dead battery that was
> attached to the motherboard.  The original battery is a 3V.  Would I do
> any damage to the board or any other components if I used a battery of a
> different voltage on the external battery connector?  I should know this
> stuff, but I must admit my ignorance.  Thanks for your assistance?
> --
> Larry Atlow                          Internet:[log in to unmask]
> Microcomputer Analyst                Phonenet: (601) 264-9639
>



************************************
Javier Vizcaino. Ability Electronics. [log in to unmask]

Starting point:        (-1)^(-1) = -1
Applying logarithms: (-1)*ln(-1) = ln(-1)
Since ln(-1) <> 0, dividing:  -1 = 1
     (ln(-1) is complex, but exists)