Well, I have never seen a schematic of an ESC yet but I worked as an Electronic Engineer for 15 years in Silicon Valley and I have seen a lot of power units. Some take the DC input and create an AC waveform that is then Pulse Width Modulated, called a chopper stage, that can be cut on and off so the total effective power is controlled. Other things happen in the middle stages like timing and then the output drive has to match the poles of the motor like 3 phase brushless motors we have on a lot of these EP boats. This is not the place to go into details but the values of a capacitor are usually made on two considerations 1) Voltage Rating and is usually twice the voltage it will be exposed to so for 14.8 input stage you would want about a 30V part but to be cheap they may have shipped with a 25V part, internally the voltages may be as high as 100V so the internal caps could be rated as high at 200V; and 2) Capacitance and this is based on how it is designed to work with other components for filtering, wave shaping, and possibly in a network to prevent back-EMF from letting spikes hit the battery or the control signal output from the RX. A chopper power supply is very noisy electronically and has to be designed also to limit the RF that would disturb the communications signal as well.

So when someone in another forum said they added a cap to the ESC, ???are they talking about?
I am left clueless as to what it improves and if they are not replacing the main caps ones with ones of a higher voltage rating, which I probably wouldn't waste my time doing because I would probably destroy the damn thing in the process, then I have no idea?

THX and sorry about the long message but yesterday was a weird day for disinformation and I was hoping for some clarity on a few things.
I have posted this question on other forums and I have gotten directions on how to build a necklace, LOL

Thanks for all the Good information I usually always find on RC Universe!

A Bright Fella from the truck forum clued me in! In the past the brushed motors caused a lot of interference on the AM / FM radios so they added filter caps to cut down on the electrical noise.
If I am right the older the bruses get the more interference they cause.
As he said, with the brushless motors and 2.4 GHz radios why would you bother, I agree.<br type="_moz" />