12v300A lithium battery with 100 cells
12V300ah lithium iron phosphate combination battery
Single voltage 3.2V cell, so 12V requires 4 strings. The total capacity of 300 depends on the capacity of your single cell. Assuming it is 3000 mAh, you need 300A/3000mA = 100 cells. So it’s 4 in series and 25 in parallel.
It's actually very simple. You will understand it if you look carefully. If you're not clear, ask again.