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I wasn't able to test voltage this morning - I started the car and went straight to work. However last time I had an issue, the battery was at ~8v. Last time I just pulled the battery out, charged it to ~14v, and things have been fine since then.
I have not yet checked the balance of the Maxwell 3000F cap pack I'm using in my car. I may not be able to until this weekend. I'll investigate this.
I can think of a few possibilities:
1) There's an intermittent parasitic draw which happened this weekend.
2) The caps are draining the battery.
3) The battery is draining the caps.
4) The battery is gradually losing charge over time due to the resistor.
5) Temperature change is causing voltage changes.
I'm quite surprised a 20Ah battery emptied out over a 36 hour period.
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