Originally Posted by Mithrandir
How would you select on test a primary cell, to test it would deplete a battery, rendering it useless.
Clutching at straws now? Well, you could measure the internal impedance (by applying short current discharge pules).
However, if a manufacturer specified you could only use primary cells supplied by them, I would have never considered purchasing such devices, unless the total cost of ownership matched or beat other equivalent devices.