>From: "Scott Holder" <[EMAIL PROTECTED]> >Subject: Re: Running around the (dead-Battery) Backhand! >Date: Fri, 30 Aug 2002 12:01:20 -0400 > >Hard to say for sure, but probably. The problem is you're taking the >power source's power, stepping it up to line level's 110-120V, then the >Duo's power brick is converting back down to what the Duo uses. You're >wasting a lot of power in that conversion.
Still, if you're going to buy the UPS for your desktop anyway, give it a shot. It's a creative solution. >I've thought about building a battery pack with a small car or >motorcycle battery >with the Duo's car adapter attached. You can get smaller lead-acid batteries pretty cheaply, they are commonly used as backups for burglar alarms. I was thinking along similar lines to Scott, except using two of these smaller batteries: thus I could supply 24 volts straight to the laptop without a Duo car adapter (which I don't have). Two points: lead-acid batteries are only nominally 12 V; they actually supply 13.8 V. SO to ensure I'm not overpowering my lappy, I would want to add a voltage regulator inline. And I would need to un-pair the batteries for charging from a 12V charger - ie in series to feed the lappy, in parallel for charging. I've even found two batteries that fit neatly under the back end of my 1400, lifting the kb up to a jaunty ergonomic angle. Clae. -- David Clae Gason, Secretary, Melbourne Wireless mailto:[EMAIL PROTECTED] http://melbourne.wireless.org.au "God picks up the reed-flute world and blows. Each note is a need coming through one of us, a passion, a longing-pain. Remember the lips where the wind-breath originated, and let your note be clear. Don't try to end it. BE YOUR NOTE." -Rumi, The Mathnawi -- PowerBooks is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> PowerBooks list info: <http://lowendmac.com/lists/powerbooks.shtml> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/powerbooks%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
