Re: 12 volts directly to 600E battery terminals?

On 15 Sep 2005 15:46:22 -0700, vburnham@xxxxxxxxx wrote:

>The IBM 600E battery is at 12.6 volts fully charged and discharges to
>11 volts (according to the repair manual). This looks a lot like the
>charged vs discharged potentials of a deep cycle marine battery My
>plan is to remove the computers internal battery and feed 12 volts to
>the + and - internal terminals (where the battery plugs in). I believe
>the need for the other two terminals is to individually charge the
>LiIon cells.
>
>Am I overlooking something obvious that will cook the computer???
>
>Thanks,
>Vance

The 600X (uses the same pack) will run down to 10.5V off the PS
jack so I would be inclined to try that since the PS is also 16V,
well within the marine's range if there is no external charger on
the marine or spikes well filtered out..

As you surmise, the other two terminals are for pack detection:
one is a thermistor, the other a data line. Both must give
correct readings or charging will not occur although power can be
drawn from the pack (no fuel gauge in that case too and LEDs blink
annoyingly), I'd be leery of connecting anything other than a
pack because there are probably no overvoltage or overcurrent
protection circuits on those terminals since only a small fused
and protected pack is expected there.

One thing I'd worry about is someone plugging into the jack while
the marine is directly connected, again, due to design was for a
standard IBM pack and its current range.

..




.

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