I just got done making a connection "system" so I can run my Duracell Pass Through mod at different voltages. I had some connectors but I realized I was already using them on a sweeper vacuum I modded a long time ago to run on 9.6volt R/C car batteries 
So anyways I use AV cables to make my connections with. All you have to do is cut the AV cables and get rid of the surrounding wire and only use the center wire for voltage (you have to make sure the outside wire is completely gone because you don't want voltage running in it because it will be exposed when in use). You take a separate AV for each Positive and Negative and I used Male connection ends for the power cables, because I had a bunch of them and only one female on hand. You can get female one from Portable DVD player cables at radio shack I'm sure. You take and put the female AV cable connections on the device and now you can hook up any voltage you have rigged up with the male AV cables. I have 6v AC/DC power supply and a 5v USB I can hook up, now I don't have to worry about having a new power supply for each Mod I can just rotate them as I want... very convenient.
Here are some pictures:
Here is the Female AV connections on the device:
Here is the male AV connections on the AC/DC power supply and the
USB:
Here is The Duracell Mod on the 6volt AC/DC power supply:
Hope you guys like it...
EDIT:
Oh and you need to make sure the polarity is right with the power going to the center of the atty connector. I put power to the red wire and ground to the white to make it easy for me to know which was which.
I have been using the AC/DC power supply a lot lately, it really give you a choker of a throat hit!!
So anyways I use AV cables to make my connections with. All you have to do is cut the AV cables and get rid of the surrounding wire and only use the center wire for voltage (you have to make sure the outside wire is completely gone because you don't want voltage running in it because it will be exposed when in use). You take a separate AV for each Positive and Negative and I used Male connection ends for the power cables, because I had a bunch of them and only one female on hand. You can get female one from Portable DVD player cables at radio shack I'm sure. You take and put the female AV cable connections on the device and now you can hook up any voltage you have rigged up with the male AV cables. I have 6v AC/DC power supply and a 5v USB I can hook up, now I don't have to worry about having a new power supply for each Mod I can just rotate them as I want... very convenient.
Here are some pictures:
Here is the Female AV connections on the device:

Here is the male AV connections on the AC/DC power supply and the
USB:

Here is The Duracell Mod on the 6volt AC/DC power supply:

Hope you guys like it...
EDIT:
Oh and you need to make sure the polarity is right with the power going to the center of the atty connector. I put power to the red wire and ground to the white to make it easy for me to know which was which.
I have been using the AC/DC power supply a lot lately, it really give you a choker of a throat hit!!
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