Re: [NTLK] Re - charging in battery tray - Resistor values

From: Ben Smith (QM Systems) (ben.smith_at_qm-systems.com)
Date: Tue Jan 22 2002 - 10:58:35 EST

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> -----Original Message-----
> From: newtontalk-bounce_at_newtontalk.net
> [mailto:newtontalk-bounce_at_newtontalk.net]On Behalf Of Johannes Wolf
> Sent: Tuesday, January 22, 2002 3:43 PM
> To: 'newtontalk_at_newtontalk.net'
> Subject: Re: [NTLK] Re - charging in battery tray - Resistor values
>
>
>
> Ok, I have not done the modification yet,
> but I really do not believe that there is another resistor
> in series to the cells, because this would
> raise the inner resistance of the battery pack to an
> inacceptable high value.
> This would make it nearly impossible to apply a quick
> charge to the cells.
> What I can imagine is that this "resistor" would be a
> temperature fuse, which blows at a certain temperature and
> behaves otherwise like a shortcut.

Correct, or more to the point an ordinary fuse, as if it was a thermal
fuse you would not be able to solder it in place.
it may or may not be a self resetting (polyswitch) fuse, in most
battery packs they are non-resetting.

> But on the other hand I do not believe that either because
> after the fuse is gone your battery pack would be non functional.
> And referring to the article at
> http://www.pda-soft.de/mp2k_battery_pack.html
> where the guy managed to open an old original battery pack
> he should have found this resistor or fuse, but there is no
> hint at all ...

It is the yellow square at the end of the pack that joins the cells
together.

>
> Regarding the thermistor this article states 10k at 20
> degree celsius.

The Japanese article rated it at 10k @ 25ºc

>
> Johannes
>

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