Lithium battery as starter assist

[ramsaymike]

I am considering changing out the house batteries with a single 100 ah lithium. In certain conditions I need to use the battery combiner dash switch to start the engine. Would this still be possible with the lithium battery? Thanks.

[ramsaymike]

Starter batteries (2) are conventional lead acid. I generally see max current is 2c so I think 200 amps 3-5 seconds for the li battery I am looking at. I don't know if the BMS would protect the protect the battery or I would risk damage.

Original house batteries are deep cycle lead acid.

[2oldman]

What are the existing house batteries? Starters can take hundreds of amps.