Let's look at what Battery Hookup says about their 16ah "combined" cells:

https://batteryhookup.com/products/2x-s ... ded-insert
THESE LITHIUM ION CELLS ARE 2000 CYCLE RATED.

Material Li-ion

module specs

Typical capacity 16AH

Nominal Voltage 3.7V

Weight : 1 LB 12 OUNCES

Dimensions of cell body: 9x138X190mm

Dimensions of cell with tabs 9x138X210mm

Dimensions of cell module: 6 5/8" x 5 5/8" by 3/4"

Internal Resistance ≤0.8mΩ

Max Charge Rate 240A

Recommend Continuous Discharge Rate 400A

Pulse Discharge Rate（3 seconds） 800A

Fully Charged voltage 4.2V

Discharge cut off voltage 2.5V

Working Charge Temp 0~50°C

Working Discharge Temp –20°C~50°C

Storage Temperature –20°C~50°C

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So they seem to think the 16ah idea would deliver 400A with no problem.

In my experience I personally think that's not valid "unless" the cells are warmed. Once you get them up to 70 degrees or more then the numbers are realistic. When fully warmed up there is almost no voltage sag and you get pretty close to what voltage exists at rest.

This makes me think that you really should use the Grin simulator and try different values for internal resistance and then see what it does to performance. Another fun thing to look at.

My guess is if you went for a single 8ah cell in series then their stated current would be 200 continuous which if you have a goal of 150 amps that's cutting it pretty close and when cold I "know" that just 50 amps and you are already getting significant voltage sag.

We had a stretch of near zero temperatures near christmas and I wanted to ses how the batteries handled it. So the first 20 minute ride was just to begin the warmup. I then charged at 35 amps. Then rode again. Second ride is already good. By the third or fourth the battery was performing perfectly.