Both battery are 36 v. The NiMh battery is 4 pin, lithium Is 3 pin. Battery is used for pump truck. After connecting Lithium battery without Bsi and Btemo pumptruck works but in limitation mode- As it says battery is empty and it drives slow. The lithium battery has its own charging status. I found online that I have to connect resistor and pump truck will see full battery then.
What would be good solution?