Charging LiIon cells in series is dangerous unless proper precautions are=20
taken.  These include a charge controller that controls the voltage of each=
=20
cell individually.  Please do some serious research before taking this cour=
se.




Received from Grant Tudor at 11/12/11 06:53 UTC:

>Russell,
>
>Thanks for your suggestions. A quick look suggests that CR123A LiIon=20
>batteries are cheap and plentiful. There are plenty of 800mAh - 1000mAh si=
ze=20
>on eBay for a couple of $ each (although I am unsure of the quality).  A=20
>couple in series (although there doesn't seem to be many battery holders f=
or=20
>this size of cell) and a LDO regulator should be able to provide the 5V I=
=20
>need. Will put together a test circuit and see how I go.
>
>Still working through your suggestions on the current monitoring for the=20
>heating elements.
>
>Regards,
>Grant


--=20
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