Neither the battery nor the capacitor is perfect by itself. The capacitors have limited (compared to a large battery) power storage however can provide nearly unlimited amounts of surge amps.... [/quote/]
I found some more info about those Capacitors and some formulas and graphs to go with them. http://people.clarkson.edu/~pillayp/c1.pdf The next thing I would look for would be a schematic of the forklift application.
Your practical application tells you what your system will do. About a minute of transmit time means you start to seriously use the capacitor bank and after two minutes the battery is probably delivering some current. I still think a half volt head start would set your capacitors up for more usage before the battery started to contribute any thing.