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'[EE]: Discharging a Siemens SL45 battery'
2002\05\30@063958 by Bernard Tyers

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Hi all,

I have a Siemens SL45 battery here that seems to loose charge in about
1/2mins, even after a full charge time. I want to fully discharge this
battery (Lithium Polymer 540mAh, 3.6V) fully to see if the battery is
FUBAR'ed or can be charged again.

I am contenplating just hooking it to a 10R 25W resistor (this won't
damage it, I don't think), and leaving it for a few hours.

Is there any better (read quicker) way, that won't damage the battery. I
don't know if there are any "smart" components there..

tia,
Bernard

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2002\05\30@101759 by Roman Black

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Bernard Tyers wrote:
>
> Hi all,
>
> I have a Siemens SL45 battery here that seems to loose charge in about
> 1/2mins, even after a full charge time. I want to fully discharge this
> battery (Lithium Polymer 540mAh, 3.6V) fully to see if the battery is
> FUBAR'ed or can be charged again.
>
> I am contenplating just hooking it to a 10R 25W resistor (this won't
> damage it, I don't think), and leaving it for a few hours.
>
> Is there any better (read quicker) way, that won't damage the battery. I
> don't know if there are any "smart" components there..


I'd bet the battery is FUBAR as you suspect.
Normally using a 3v torch light globe is a
good way to discharge batteries quickly and
safely. I have an old commercial NiCd discharger
that is a light bulb in a box.
-Roman

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2002\05\30@133134 by Peter L. Peres

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On Thu, 30 May 2002, Bernard Tyers wrote:

>Hi all,
>
>I have a Siemens SL45 battery here that seems to loose charge in about
>1/2mins, even after a full charge time. I want to fully discharge this
>battery (Lithium Polymer 540mAh, 3.6V) fully to see if the battery is
>FUBAR'ed or can be charged again.

If you charged it with a regular LiIon charger and it does that then it is
100% fubar'd imho.

>I am contenplating just hooking it to a 10R 25W resistor (this won't
>damage it, I don't think), and leaving it for a few hours.

Don't. There are LiIon battery charge/discharge curves available on the
web (from manufacturers). Search Google Groups for this group and LiIon
for some links. Most LiIon batteries have an internal circuit that
prevents deep discharging or overcharging.

Peter

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2002\05\30@141121 by Barry Gershenfeld

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>>I have a Siemens SL45 battery here that seems to loose charge in about
>>1/2mins, even after a full charge time. I want to fully discharge this
>>battery (Lithium Polymer 540mAh, 3.6V) fully to see if the battery is
>>FUBAR'ed or can be charged again.

If it discharges itself in 2 minutes, then your discharge
circuit is apparently already built in.  :)

Barry

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