Silent Jack

If using 6 of them in parallel, you would add the capacitance and the voltage would be equal to the value of the lowest voltage capacitor in the bank. Optimally, they would all be equal. In your case, with camera caps they should be 330V and between 80uF and 160uF, depending on which cameras you get. While the original charging circuit can be clipped and used, it will be slow and low power. If you use several, you can get away with a bit bigger batteries, but there are limits. It would be better to build a simple charging circuit. There are a variety of open or shared designs available on the web that can be used. A few inexpensive semiconductors and other low cost components and you will be surprised what you can do. Safety is a first though. Always be sure to wear all the proper gear and make sure your work and testing area are clear. If you have more questions let me know. I am eager to hear how your project turns out.