Gordon,
The TCU sends a "BOOST" command to the GSU everytime it turns on the starter. A constant current of 3A is injected into the system (can be set to max 5A). As long as the Duralites are not forced into a overvoltage condition it should be OK. In our quest to reduce installed weight we designed the system for 4 cells which require very high current to supply the required watts. In the case of Li-Ion the voltage is a lot higher so some reduction in current may be seen.
Doug,
Typically 20A at first turn to about 8 A at 10K with 4 cells. Once the engine fires and spools up this drops right down to 2 A.
Once again I do not have any exposure to Li-Ion so it may be the scenario described above is quire feasible.
Andre
MD BMT