Lithium Ion Battery Model in LTSpice
You can use a scheme like this:
It uses a seperate circuit to simulate the battery. The problem will be deriving the values for the battery that you have, the values for the series resistance , and the RC values for the battery will need to be formulated by you. The way to go about doing this is described in this paper: An Accurate Electrical Battery Model Capable of Predicting Runtime and I–V Performance
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Source:
https://www.edaboard.com/showthread.php?214394-how-to-make-a-battery-model-of-NiMH-on-HSPICE
Note the dependent sources would be b-sources in LT-spice with nodes for the inputs.