How to charge 3.7v li-ion in a series (2s)

[stormy121]

So im attempting to make a charger that can charge 2s li-ion cells, the problem is this,

They will be inside of a speaker dock so the normal charging isnt something that i want to do.

So i thought about how laptops are charged, this is exactly what i want to do with the dock, but i wanted to research get some advice etc before hand.

This is what i have setup so fair in terms fo being able to charge them,

Problem is im pretty certain that if that switch isnt flicked it will only charge one battery...so advice is needed on either a better setup or a way i can do it, thanks!

 

[IRstuff]

But, that's only because of the way you configured the circuit. Commercial multi-cell charge/balance chargers don't use switches at all.

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[stormy121]

Correct but they require you to use a lipo charger to make sure they are balanced charged, this isnt going to be possible due to not being able to remove the batteries, do you see my dilemma XD

 

[IRstuff]

No, I don't. Why can't you leave the battery charger in place, since that's the way your example laptop charger is configured?

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[stormy121]

oh really? i had no idea that was the case, if this is the case can you suggest a balance charger that would be good to be implemented into my project?