Date: Sat, 23 Aug 2003 20:16:15 +0000 From: "Cerulean Skies" <[EMAIL PROTECTED]> Subject: Re: [LIB] Li-ion cells and memory expansion
Date: Fri, 22 Aug 2003 07:50:21 -0500 From: "John Musielewicz" <[EMAIL PROTECTED]> Subject: Re: [LIB] Li-ion cells
From: "Cerulean Skies" <[EMAIL PROTECTED]> Sent: Monday, August 18, 2003 10:07 PM
> Date: Tue, 19 Aug 2003 03:02:34 +0000
> From: "Cerulean Skies" <[EMAIL PROTECTED]>
> Subject: Li-ion cells
>
> >From: [EMAIL PROTECTED]
> >Subject: Re: [LIB] Charging problem
> >Date: Tue, 29 Jul 2003 20:13:26 -0700
> >
> >This site:
> >
> >http://www.sciplus.com/photoPopUp.cfm?photo=33962.jpg&;
> >name=Camcorder%20Battery
> >
> >shows a JVC camcorder battery containing what appear to be the proper
> >Li-Ion
> >cells for $6.95/pr, so about $21 for a battery case full. I emailed them
> >for
> >dimensions, and they are very close to the size of the Panasonic cells in
> >my
> >PA2503 packs. Haven't used them, though.
> >
> >Lee
>
> Hello folks,
>
> I bought the above batteries and found that they are 2mm shorter but 1mm
> wide in diameter, which means they don't fit inside the extended battery
> case, unless you're okay with a bulging case.
Been there done that. Just leave the cover off and they'll fit. Check the archives to find out more on 18mm thick cells.
Yeah they'd fit without the top cover, but I'd like my laptop to not look like ass.
If there was a guaranteed supply of these batteries, I might be convinced to cut off the back half of the top cover so that the batteries are not exposed when the pack is in, but that's still not a great solution since I have 2 battery packs that I swap in and out.
> The product number of the cells in the extended battery is CGR17670HC, and
> those from American Science and Surplus are CGR18650. Using those numbers
I
> found this:
> http://www.slavin4u.com/lithium.html
> They have the Lib cells for $8.33 per, with $3 shipping, gives $53.
> If the larger cell size of the CGR18650 are okay with you, you could go
for
> the American Science ones for $6.95 + $6.95 shipping = $27.80.
> The slavin4u site also has higher capacity CGR18650's, giving you ~50%
more
> mAH for $8.95 per = $56.70.
I get that using the battery pack on my site. It uses the 1.5Ah cells. About
5 or more hours!!
That's an excellent usage time. I don't mind bringing an extra battery pack with me since the size difference isn't that significant, so I'm trying to maximize charge per cost over two batterie packs. If I am extremely concerned about how much stuff I'm carrying, I'd opt for the 1.5Ah 18mm cells.
> Tips for cracking the Lib battery case if you do decide to switch cells
and
> want to keep the case relatively intact:
> Use a thin screwdriver and push it into the seam towards the thinner half
> (the "top" when the battery is installed in the Lib). Start from the edge
> with the connector, pushing the screwdriver along the seam to crack all
the
> glue. Do both short edges and open up the case a bit along the 3 cracked
> edges. You may need to pay extra attention to some of the corners and
break
> the glue there. To crack the front, I used my fingernail to avoid
scarring
> the plastic. Go slow, and you should be able to open your battery case
> without it looking like a dog chewed on it.
Just take the pack and cells to Batteries Plus or some similar shop. They will crack the case and if the tech has handled li-ion before probably solder in the cells for 10-20 bucks or so.
Yeah if you don't have good soldering practice/habits it may be best to leave it to the pros.
John, you had made some inquiries regarding the possiblities of increasing the expansion RAM size in the Lib100. I have found a couple of pictures of Lib100 RAM expansion modules online, with their product ID number sufficiently legibleto look up on another site. The two issues are:
1. How to find larger size DRAMs (or if they are even made). The DRAM market is pretty much all SDRAMs nowadays, so if indeed larger sizes were made, we may have to scavenge them from other laptops or their components.
2. Whether or not the DRAM controller can handle the larger DRAM. According to the repair manual, the DRAM controller is part of the System Controller Gate Array, which means it's possible that the 32MB maximum is hardwired into the gate array. However there's no way to find out unless we construct a 64MB expansion and have it work or fail.
I was originally thinking along the lines of building an expansion with non-TSOP chips since they are easier to find, just to test if the controller can handle it. But then this will probably leave the delay times all shot to hell. So basically it'll have to be a full on working beta unit to plug into the Lib. So unfortunately this is way too much cost and engineering time to be worthwhile for a project that may be all in vain.
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