Date: Sat, 29 Sep 2001 12:42:16 +0800 From: Raymond <[EMAIL PROTECTED]> Subject: Re: Homebrew battery packs
>That would be a bad idea. Lead Acid cells drop to zero current at full charge. >Nicads and NIMH's increase current at full charge. >Not that you couldn't run it from NIMH, but the lib's charger is not a good match to >NIMH or Nicad cells. Hmm ... could you recommend a webpage or book which would have a suitable circuit or a suitable discussion on how to build a simple circuit that would allow me to charge the pack using a 15 volt supply like the Libretto's power supply? I wanted to use NiMH because I've got a new 3.5AH 12 volt NiMH battery pack which is a good size (its about 2/3 the area of the Libretto's base so if I were to make it into a slice there would be plenty of space for a charging circuit) - it WAS for a laptop I used to have which died about a month after I got the new pack :-/ >>For that matter, can anyone give me a ballpark figure of how much current the >Libretto 50CT (clocked to 100MHz if that makes any difference) could be expected to >draw on low power (or high power for that matter)? > >I used to know that. It's something less than 2A. What sort of battery life do you people with 50CTs get with new battery packs? I know the pack is rated at 1.2AH but my Libretto 50CT is second hand - the battery pack is already shot so it only runs for half an hour on a full charge. For that matter, does anyone have any opinions or experience regarding how you can trick the regulator on the Libretto by first applying 15 volts (to get it to turn on) then dropping back to 12 volts to run? (Xin does it on that page I posted earlier.) I'm just a little hesitant to try that out as the manual does state (page 2-3 in my manual) that 'Inadequate voltage ... could damage the computer'. For that matter, given the inbuilt pack is 10.8 volts, is it likely to charge if the input was dropped to 12 volts? (I have no idea what sorta voltage drop your average charge circuit would have). - Raymond ************************************************************** http://libretto.basiclink.com - Libretto mailing list http://libretto.basiclink.com/archive - Archives http://www.picante.com/~gtaylor/portable/faq.html - FAQ -------TO UNSUBSCRIBE------- Reply to any of the list messages. The reply mail should be addressed to: [EMAIL PROTECTED] - Then replace any text on the message's subject line: cmd:unsubscribe --------TO UNSUBSCRIBE DIGEST------ Do above but with this on subject line: cmd:unsubscribe digest **************************************************************
