I've now taken some voltage readings.
Drawing 20 Amps, voltage drops about 3 Volts throughout the discharge cycle.
Rest voltage drops about 2V over the discharge cycle (39.5 to 37.5) which means that there is no chance of hitting a low-voltage cut-out early (28.8), even with a 30 Amp limit which I have used without problem.
Those figures give an internal resistance of about 150 milliohms which is only a little over the specification of 120.
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