Domino60:
It's working really great as it is, i just added a 8 x 8cm fun on the side and it's cooling down really well/fast.
It's funny how you keep saying fun instead of fan 
Domino60:
Why would i need 2 of them to drop down the voltage if they work really good as it is.
As you see they can handle the voltage and the current I need,No it does not really. The charger can easily overload the module. That's the whole point
It's like, better save then sorry. If you build it into a set and you use it for some time you tend to forget stuff like that. And then you think, ow, a 6S, I can charge that and damage your setup in the process. A second module is cheap and makes it more rugged.
Domino60:
But right now I don't charge more than 2ALike told before, only the charge current says nothing about the current though the step down. 2A is the current to the pack. With 3 LiPo's and an efficiency of 80% (not uncommon) you are already up to 2,9A for the step down!
@Mark, you just said "Its an emitter-follower driven from a zener...", not pointing to common circuit in my opinion but "it's" referring to the step down. If you meant another circuit it's a good idea to say so / post it. So it's just a matter of misunderstanding
MarkT:
As for reading does The Art of Electronics editions 1, 2 and 3 count?It certainly counts
But because of your "it's" reference I meant the topic itself because I thought you missed the point of the module being a switch mode step down.