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I've been running a bank of 3000F 2.7v Super Caps in place of my battery for a while on my car. The only issue is the standby drain is so high that it will only last a few days on the capacitor alone, so as such I do have an auxiliary battery in the trunk. I don't have a balancing circuit, but I have checked the individual caps every few months and there is very little imbalance.
The car doesn't care and cranks instantly regardless of weather. I also connected the capacitor with a Anderson disconnect, and have the aux battery wired separately to maintain the ECU/clock/radio.
My original intent was to have it available for a jump start kit by connecting alligator leads to the disconnect, but I've been too lazy to finish it.
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