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Hi, Reddevil
Nice project.
I suppose in this post that you will grid charge only the lithium.
When this is done you will connect the lithium pack on the nimh.
Of course you will use a contactor, if not the connectors will be quickly destroyed.
When parralleling the 2 packs, you may have an important current.
It depend upon the voltage of the 2 packs and the sum of the 2 internal resistance.
It is a good idea to use summer internal resistances. They are the smallest possible then the amperage will be the maximum. Also using the smalest voltage for the nimh and the maximum for the lithium.
Then an other good idea is to check that the cells will accept this amperage. Nimh cells and lithium cells. In this situation lithium will be discharged and nimh charged. This just before driving.
Ninh sitting in the car will be cold in winter.
But lithium could be grid charged at room temperature or in the car, so being cold.
An other solution could be to grid charge the 2 packs. But end charge is not detected the same way.
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