Double Capacity MintyBoost with 4-AA Battery Holder Modification

Step 2 Analysis of the modification

The battery holder that we are modifying is configured to deliver 6 volts via the red and black power leads by connecting the batteries serially as shown in the image below. The red power lead is connected at point #1 which makes contact with the positive side of the first battery that completes the connection to point #2. From there the battery holder has a wire running along its back side that connects point #2 to point #3. The second battery completes the connection between point #3 and #4. Point #4 and #5 are actually one physical connection made up of a spring (#4) and rivet (#5) wired together. Points #5 and #6 are connected via the third battery. Point #6 and #7 are another spring/rivet pair. And finally the last battery makes the connection between point #7 and #8. The black power lead is connected to point #8. This serial connection of 4 AA cells results in the 6 volt output.

The modification we are performing is reflected in the next image and will result in 2 pairs of serially connected AA cells. The first pair (red arrows) will use the existing power leads. We will add new power leads to the second pair (blue arrows). Once we have 2 pairs of power leads they will be connected in parallel with diodes added to prevent current flow from one set of batteries to the other.
 

Comments

[pep2798]

or you could just buy 2 2 aa holders and just lay them end to end

[RoysterBot]

Yes you could. I initially tried that but prefer the nice tight fit I get with the 4AA holder.