> -----Original Message-----
> From: piclist-bounces@mit.edu 
> [mailto:piclist-bounces@mit.edu] On Behalf Of microsoftwarecontrol
> Sent: Tuesday, May 02, 2006 6:11 AM
> To: piclist@mit.edu
> Subject: [EE] stop wasting time on Li-ion and Acid Lead 
> battery charging
> 
> 
> I recently suddenly realized that
> Li-ion battery can be simply charged 
> by a 4.2 contant V source adding a max 
> current limit resistant. That means a cheap LM317 for 2A 
> charging or a 5A voltage regulator, plus a 1 Om 5W resistant, 
> will do the job fine. cost is 5 dollar all together. It is 
> sufficient, and has a basis: every Li-ion pack has build in 
> protective pcb already.
> 
> So, why still bother with the long list of Li-ion
> battery charging IC? 
> 
> Acid Lead battery is the same story.
> 
> Am I wrong in this point?

I have Li-ion packs that do NOT have protection Ics in place.  Don't do
this with Li-ion batteries.

Rob
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