Looks like my 12v lead acid battery has had a very timely demise - this morning it was 15 degrees, and my car wouldn't start using the starter. Rolled it down a hill and dropped the clutch to get to work, but I need this up and going soon.
These look promising to run in parallel with the caps:
https://www.batteryspace.com/li-ion-...lead-acid.aspx
There's a 20ah pack for $130, and one with an LED balancing circuit for $190. Thoughts?