nima_1981
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An IC difference amp, as I proposed in post #4, has the resistors matched very closely so the error from that should be acceptably small........................
Resistor networks can introduce measurement errors, and if the batteries are very small, the resistors will set up a continuous discharge which will be uneven between batteries. It would certainly work, but it is far from the perfect solution.
Since you didn't post your physical "region" I didn't know what you can or cannot: purchase. :-?i can not find LT1991 in our region ? could you please redesign that with ad620 or another popular opamp such as tl084.