Hello,

I'd like to design a simple lithium Ion battery charger for my own use. It
does not have to be fast, elegant, or pretty. As I understand it, Li-Ion
batteries are normally charged with a constant current until the battery
reaches a cutoff voltage of ~4.15 volts. After the cutoff is reached a
constant voltage is maintained until the battery is removed.

However, in my case I don't particularly want to use a dedicated charger IC
or a microcontroller to manage the charge cycle. So my question is: would a
fixed voltage (perhaps 4.2V, current limited through a resistor) be
suitable for charging a lithium ion battery?

The only disadvantage of this that I can see is that charging will be
significantly slower and a full charge may not be achieved in a
"reasonable" amount of time.

--=20
Jason White
--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.