I'm trying to figure out if I can improve the elimination of noise. I always decouple my IC's by connecting VCC and ground together with a 100nF ceramic capacitor, But I'm curious. In each picture below, assume the top battery is 2V higher than the lower battery and all batteries are fully charged. Also assume the capacitors are all electrolytic and are at least 10uF and can handle 16V. The mid-point between the two sets of batteries deliver the lower voltage that's needed.
Which of the circuits shown is the best for decoupling?
Should I follow the left-most circuit where I decouple each battery set individually?
or should I follow the middle circuit where I combine the sets together first before decoupling as if all batteries are one big voltage source?
or should I just continue to follow the last circuit where each voltage point above 0 gets grounded via a capacitor?
or should I combine any of those circuit ideas?
Also, there are no negative voltages.