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I recently suddenly realized that
Li-ion battery can be simply charged=20
by a 4.2 contant V source adding a max=20
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?=20

Acid Lead battery is the same story.

Am I wrong in this point?









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