> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Vitaliy
> Sent: 16 November 2009 17:44
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] Batteries in fast-charging "Faraday" flashlights
> 
> Jake Anderson wrote:
> > The torches use ultra caps I think (the LED ones) and the toys use
> > lithium ion polymer cells way beyond what they are speced at ;->
> 
> Time to reveal the embarrassing details.
> 
> I got a hold of a small RC car. It gets charged from the remote (4
AAs),
> which has a barrel type plug on the side. You plug it in, wait a few
> minutes, the red LED on the remote goes off, the car is charged.
> 
> Skipping the obscure reasons why anyone would do this, I decided to
charge
> the car from a 5.6V Nokia charger. Unfortunately I got distracted, and
> left
> it plugged in far longer than intended. I was reminded of the fact by
the
> smell of melting vynil and plastic.
> 
> The battery inside the car has two small cells connected directly to
the
> power jack. I opened up the remote, and confirmed that it has some
sort of
> overcharge protection circuitry.
> 
> The cells are about as wide as a AA battery, but only about 1/3 as
long.

1/3 AA is a "standard" size cell, along with numerous other fractions:

http://www.powerstream.com/Size.htm

Regards

Mike


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