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Do the documents on leaking tell you at what capacity they were charged to while testing? The fuller the capacitor in relation to its max charge, the faster it will leak.
How are you dealing with performance issues since capacitors power output varies significantly with charge? I = C dv/dt for DC power. Capacitors discharge exponentially so you will be at 2/3 power after one time constant. With batteries this is fine since you will only be using a specific portion of the capacitor, but I've never understood how you can get reliable performance out of a system built without batteries (or fuel cells). Hopefully you can help an electrically deficient mechy understand.
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