Or you could just buy a Turnigy 3S balancer and charger for $4.50,
does pretty-much exactly this. Back-order at the moment though.
http://www.hobbyking.com/hobbyking/store/__7637__Turnigy_balancer_Charger_2S_3S.html[1]
> I suggested a module made up of a lithium charger IC, a switching
> mechanism that could isolate those batteries in the chain
(envisaging no
> more than 3) once they've charged and some form of electronic load
> (probably a FET). It has been proposed that each battery could have
its
> own switch controller and thinking about this a small Pic or Atmel
chip
> could be used to provide the intelligent switching per battery with
the
> charger/battery gauge chip providing the correct charging
algorithm, the
> controller chip would either switch it out of the pack chain or
> alternatively switch in the active load to maintain that particular
battery
> charge state.
>
> Does this seem workable in theory?
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