on 27/09/03 11:23, Dr. K. Gensberg at [EMAIL PROTECTED] wrote:
Hi again! I've cracked mine open and there are 12 cells, type:
Panasonic Lithium ion CGR17670HC
I have a pdf file from Panasonic which describes these cells in detail, if anyone is interested.
If anyone has a clue where I could get 24 of these (or equivalent) at a sane price, I'd be very happy! Perhaps there's a bulk discount if we club together?
Search down the local Panasonic manufactures rep. It should be available from their webpage.
Know that even if you replace the cells, that doesn't mean the battery will
start working again. "Smart" laptop batteries, like the ones in Wallstreet,
Lombard and Pismos, to name a few, have an electronic circuit board that
communicates with the computer to let him know about the state of the
battery. These circuits have apparently a tiny non-volatile RAM that is hard
to reset. If the last information stored is about the battery being dead,
then the battery won't recharge, even with new cells. I know because I did
replace the cells in a Pismo battery but the battery never charged when put
back in the Pismo.
There are several manufacturers of battery control chips. Look at the numbers on the chip and tell us which one is used. (let's hope its not a custom part, an standard part marked with an in house number (Apple does this), or a specially programmed microprocessor).
The chip documentation will tell how to reset it. As to whether it's easy to do is another matter, it may require a implementing a communication protocol. I don't know if these chips implement a EPROM type memory to store data non-volatile data, or if they depend on a small amount of voltage from the battery always being there to keep alive a CMOS RAM. Anyway, the chip spec will reveal those details.
So, beware before forking out some hard earned cash on cells that could be
useless. However, if you want to try, go for it. Maybe you and we will learn
something in the process...
-- G-Books is sponsored by <http://lowendmac.com/> and...
Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Check our web site for refurbished PowerBooks | & CDRWs on Sale! |
Support Low End Mac <http://lowendmac.com/lists/support.html>
G-Books list info: <http://lowendmac.com/lists/g-books.html> --> 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/g-books%40mail.maclaunch.com/>
---------------------------------------------------------------
The Think Different Store
http://www.ThinkDifferentStore.com ---------------------------------------------------------------
