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Originally Posted by BrianG
ZPB: OK, but 140F will make one hell of an arc! Current would be theoretically infinite, only limited by the battery capacity and wire gauge. IIRC, last time this came up, I suggested that you permanently wire a cap to each pack to avoid arcing from the initial connection. Just use a resistor on initial charge to force a lower charge. This would definitely let you use much lower C-rate batteries since the cap will take care of just about all current pulses. And you'll get closer to the actual Ah of a battery since it won't be running as hard. However, will the price and weight increase be worth it? I say you try it and see - I'd MUCH rather spend your money ;)
Are you sure those are the ones that Quark uses? If so, I'll probably wire an extra two on the Quark and a couple on the MM.
suicideneil: Running a capacitor at lower voltage is perfectly fine, it will actually extend the life of the internal insulator since it's not running close to its max. The only downside is the slightly bigger physical size. It'll be better for your batteries, but not sure if you'll see a noticeable increase in performance. But it sure won't hurt - just make sure you hook it up right. :)
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Yeah, of course Brian! That wouldn't be an arc, that would be critical mass occuring at contact! :005:
I would have them as part of the pack, but wired with little wire as possible, and shorten all wires between it and the esc. I can also set current levels of 0.01 amps with the power supply I use, as you might know.
About it being worth it, I really do think it would be worth it, not considering weight, just looking at performance, reliability, and much longer cycle life of the battery. I wouldn't doubt it would pay for itself even before the battery is at end of life. I can see it AT LEAST tripling the battery cycle life.
BTW, I made a mistake on price, they are $15 for the 120F U-cap, you need 8. They have a calender life of 10 years, cycle life of 500,000.
It looks as though they have a high energy version and a high power version. The 120F being power, and 140F being energy, the 120F has a lower ESR of 0.0025ohm, the 140F is 0.0035ohm.