Well, that is a question of design: the battery current is not measured directly, but via a shunt, which is why there is theoretically no upper limit.
However, the internal Sigma-Delta ADC is limited to 14bit and has a typical LSB value of 5.88µV. So the larger you make the current, the lower the resistance of the shunt and the coarser the measurement will be.
Regards
/Peter
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