Back in topic...
Dallas Semi offers some very good Li - ion / Li Po protectors... It's all about an IC... and some external but they are worthless...
Now the bad thing is that HELL they don't offer samples for their protectors... DARN, I wanted some... That's unfair....
Anyways...
I think TI has some protectors as well... Go there and see what you can fetch... they offer samples as well...
Good hunting,
Lefteris