Date: Wed, 11 May 2005 00:49:01 +0000 From: "Matthew Hanson" <[EMAIL PROTECTED]> Subject: RE: [LIB] Rebuilding a battery pack
From: John Niemi <[EMAIL PROTECTED]>
Thanks for all replies, you have been most helpful! Just a few more questions;
if I end up buying 6 cells that are 1500mAh each, do I end up with a 1500mAh
battery pack? If yes, then that is not so long-powered I think...?
From what I've gathered, the cells are connected in a parallel/seriesarrangement. 2 sets of 3 cells are connected in series boosting the voltage from 3.6v to 7.2v. And then those 2 sets of 3 cells are then connected in parallel to boost the total capacity from 1500mah to 3000mah. A reasonable boost over the old 2400mah packs.
Also, what are these "Saft Primary Lithium Thionyl Chloride Batteries" seen in
http://www.slavin4u.com/lithium.html and can they be substituted? Asking
because there is a 3400 mAh version for sale on the above page and it's
dimensions are just a tad smaller than the Panasonic CGR17670HC/CGR17670HG (the
original battery). But I assume the replacements must be Li-Ion and Li-Ion
only, right?
Raymond should know more about this. All I know is that he was told that the charging circuit in the 100/110 can deal with charging cells that are not greatly larger in capacity than the originals. How much larger would define the high end limit I think is something no one has determined yet. Whoever does the testing will want to put the battery pack under a container that can deal safely with an explosion if the cells aren't happy with their setup.
The point is I want to do this operation once, and then do it with the best
available parts. I want the best cells I can get (for a reasonable price) so I
don't need to open up my battery pack again in a looong time.
PS. I managed to get the pack open with just a few slight scratches on the
visible parts of the battery pack (the part that goes hiding into the Libretto
is pretty scuffed though because I used too much brute force but that doesn't
matter :) I stopped to think for a second and used a very slow technique on the
visible parts of the pack; I slid a very very small screwdriver in the seam and
used a small hammer to tap it along the seam so that I never had to jerk the
screwdriver in or out of the seam... I just tapped it slowly and gently so that
the glue came off and the seam opened in little steps... I really don't know
how to describe it but if someone is interested I could try to take a few
staged pics of the method I used.
I had a lot of luck cracking the edge by pressing a weak point with a wide blade screwdriver until I heard the glue crack. At that point I was able to use my fingernails to start opening an edge. Then I found that I could insert a small 1/4 inch strip of plastic cut from a credit card into the opening, and then just pull it along the side to expand the opening. I did have to take a small flat watch screwdriver to one or more of the corners though. In the end there was only one very small scratch that's hardly noticible.
I swapped the contents of my L70 pack into the L100 pack, and didn't bother to glue the sections together. It fits securely into the L100, and at some point I may go the road you're going John.
Matt
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