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A linear I-V plot does not make a resistor. An I V plot of a battery
is linear (at least for small current draws) but it is not a
resistor. For a resistor, the graph must be proportional, linear
with no intercept.
I wish texts would make clear that "internal resistance" of a battery
is a dynamic resistance, and that this model of a battery only works
for limited amounts of current drawn from the battery.