"Milliamps per minute" is an almost meaningless unit of measurement, which suggests that the people doing the measurement were not very savvy in their knowledge of electronics.
Milliamps itself is a measurement of charge flow per unit of time, so milliamps per unit of time would be what, a measurement of the acceleration of the flow of charge?
It reminds me of all of the solar power "experts" who talk about "kilowatts per hour" when they should be discussing "kilowatt hours". It makes a difference.
But that's all mathy and sciency and stuff, which is much too hard to understand (said Barbie)...
They perhaps meant to multiply with time which would yield the accumulated charge (in Coulombs).