blk@mitre.org (Brian L. Kahn) (03/13/90)
Netfolk: shouldn't this approach work on any and all laptops going on a long trip? 1) Take out the internal battery (so you don't try to charge it). 2) Get a bigger and heavier battery than one would normally want to use, either a fancy gelcel/lead-acid thing or a big pack of nicads or even a disposable lantern battery. 3) Connect it to the laptop where the DC transformer usually plugs in. Sure, it might weigh a few lbs, but it could operate for nine or ten hours. Am I missing something? -- B< Brian Kahn blk@security.mitre.org "may the farce be with you"
phr@acsdev.net (Paul Rubin) (03/14/90)
In article <BLK.90Mar13103146@vanity.mitre.org> blk@mitre.org (Brian L. Kahn) writes:
Netfolk: shouldn't this approach work on any and all laptops going
on a long trip?
1) Take out the internal battery (so you don't try to charge it).
2) Get a bigger and heavier battery than one would normally want to
use, either a fancy gelcel/lead-acid thing or a big pack of nicads
or even a disposable lantern battery.
3) Connect it to the laptop where the DC transformer usually plugs in.
Sure, it might weigh a few lbs, but it could operate for nine or ten
hours. Am I missing something?
Yes. Laptops often expect the DC transformer to supply a higher voltage
than the internal battery (or sometimes not even DC). They then use
the battery as a voltage regulator/ripple filter etc. Doing what you
suggest would damage many kinds of laptops.