Double Capacity MintyBoost with 4-AA Battery Holder Modification

Step 6 Battery bank 2 negative terminal

The left side of the first image below shows the fruits of our labor so far; battery bank 1. As we can see by the red arrows we have a connection from the red power lead through one battery to the connection path we created in the previous step then through the other battery to the black power lead.

Now we need to complete battery bank 2. The connection path for this bank is shown in the image below by the blue arrows and will start at the remaining half of the black wire we cut in the previous step. It will then flow through one battery which is connected to the other battery via an existing spring/rivet connection. That second battery will then connect to a spring connection that we are about to add.

Take the spring that we extricated earlier and remove the bent end by clipping the wire at the point indicated in the second image below. Next solder a 22 gauge stranded piece of hookup wire about 3.5” inches long to the spring as shown in the last image. It is recommended that you use wire with black insulation here since this will be the negative (-) power lead for battery bank two. We will use this spring and wire in a later step.