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Absolutely true Stephen, looking at the specs, maybe not quite good enough for Chieftain, not sure what the model will pull current wise, so I will be looking forward to the run testing.
This particular battery maxing out at 20amps continuous discharge, peaking for a few seconds at 40amps.
But prices are falling and as long as the spec's are ok and they conform to certain standards, why not.

Product description
Size Name:20Ah, 12.8V, 256Wh | Style Name:Battery plus charger
Model Number - 128-020
Rated Capacity (Ah) - 20Ah
Watt Hours Capacity (Wh) - 256
Preferred Minimum Charge Current, 0.1C (Amps) - 2A
Charge Current (Amps) - 5A
Max Charge Current (Amps) - 10A
Standard Continuous Discharging Current, 0.5C (Amps) - 10A
Max. Continuous Discharging Current, 1C (Amps) - 20A
Max. Peak Discharging Current for only 3-5 Seconds, 2C (Amps) - 40A
Weight Approx. 2.8kg
Dimensions WxHxL (mm) - 165x125x175
Height with Terminals (mm) - 135
For All Battery Models

Nominal Voltage - 12.8V
Max Charge Voltage - 14.6V
Discharge Cut Off Voltage - 10.0V
Outer Package - Solid ABS Case
PCB Protection Over-Charge, Over-Discharge, Overcurrent and Short Circuit
Operating Temperature Storage & Charging - 0~45℃
Discharging - -20~60℃
Cycles 2000 cycles @100% D.o.D, after this, 80% capacity remaining
Design Lifespan - 15 to 20 Years
Warranty - 2 Years

I use 2 of these:
https://www.i-tecc.de/shop/lifepo4-batt ... 20ah?c=108
I bought them from another supplier, in these batteries you can open the top cover, they are composed of 4 elements joined by copper brackets and M6 bolts, I connected some plugs to make the balanced charge (4S) and I made an adapter from 2 x 4S to 8S mounted under an opening door of the tank, I reload them via an xs60 plug.
in my tank, when off there is no electrical connection with the electronics, I have a battery switch
Marco

does anyone know the ah the motors draw`when driving?

The maximum will be peak current divided by 3600, then multiplied by number of seconds of driving time.