> This is how simple a Li-Ion/polymer charger can be, as long as you 
> include under-voltage protection in your design to ensure the cell 
> voltage dosen't drop below ~2.9 volts.
>
> http://www.shdesigns.org/lionchg.html

I was pretty sure, from having looked at the charging specs, that 
something about that simple was viable.

That circuit is very nice and is OK for manual use by an intelligent 
person but still needs addition for full automatic operation. But by 
the time you add the essential low voltage discharge protection and 
trickle start up for low voltage cells you are probably better off to 
also add a cheap processor.



        RM
 

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