Re: [avr-chat] Li-ion cell phone batteries

[Robert L Cochran]

Blake,

Thank you, I think I'll buy a Battery Bunker (
http://www.batterybunker.com/index.php?page=products ) since I also have
two Lithium Polymer batteries that I've been using to power my various
breadboard circuits. The charger I mention below is specifically made
for LiPo and Li-Ion batteries.

I'll look over Digikey in the morning. My problem is, I don't know what
to call these tiny 3-wire connectors. Worse yet, I don't know Digi-Key
search engine speak.

And worst of all, I'm not an electrical engineer...I'm just an assembly
language programmer struggling to understand circuits...but I sure like
playing with them!

Thanks

Bob


Blake Leverett wrote:
> I don't know where you can buy the connector - try Digikey first - but I will 
> caution you to be VERY careful with Li-ion batteries.  Many people have 
> burned down their houses, cars, and garages messing with these things.
>
> LiIon batteries are pretty safe, until you damage it (drop it or accidentally 
> poke it).  I have a friend who accidentally punctured one with a screwdriver, 
> and it caused a fire he could not put out - water only made it worse.  
> Luckily it was in a sink and he finally got a fire extinguisher to put it 
> out.
>
> Also, charging the battery incorrectly is very likely to cause a fire.  Make 
> sure you use a LiIon charger, and don't leave it charging unattended.
>
> The RC community (guys playing with model planes and cars) have learned that 
> the only safe place for an unattended LiIon battery is in a fire-proof 
> container, like a bucket of sand, with the batteries under half the sand.  No 
>  
> kidding.
>
> I know that your laptop and cellphone have a LiIon battery and they are very 
> safe.  But having one on the bench running around loose, and being manually 
> charged, is a potentially dangerous situation.
>
> See these pages for some pictures:
> http://www.rcgroups.com/forums/showthread.php?t=140641
> http://www.laureanno.com/RC/fire-pics.htm
>
> Sorry to be so pushy about this, but most EE's don't know how dangerous these 
> things can be.  So just be careful, and don't leave it sitting around on a 
> wooden table while it charges.
>
> Blake
>
> On Friday 28 March 2008, Robert L Cochran wrote:
>   
>> Since Joerg advised me to try powering my ATMega644 circuit with a 3.6v
>> battery, I found one in an old Sony Ericsson cell phone. It is a Power
>> Products rechargeable battery. It is small, square, there is some sort
>> of dark wrapping around it, and on the left side is a very small white
>> plastic, 3-wire connector with black, blue, and red wires. The blue wire
>> is the center one. The print on the battery is partly rubbed out but
>> "Ericsson T60/61" is still legible. The phone is a model T61c. There is
>> no voltage printed on the battery label.
>>
>> I think I can charge this battery with my Pro-Peak Prodigy II charger,
>> if only I can find the right connectors for the battery. And that is my
>> question. Where can I find connectors that would make this battery
>> useful on charger and/or breadboard circuit? The charger should be able
>> to get the voltage and current rating from the battery's circuit board,
>> right?
>>
>> Thanks
>>
>> Bob Cochran
>> Greenbelt, Maryland, USA
>>     
>
>
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