This really depends on which mini! In the metal REO Mini, I won't use anything but the black AW ICR 14500 because there is more room and the spring is NOT overly compressed. It actually looks like it was designed for the larger 14500 platform. Just wish I could get the Panasonics in something that small. Conversely, in the Mini Woodvil you really shouldn't use anything but a smaller-length offering like the IMR because as Nerak's image demonstrates the fail-safe feature of the spring will be negated and should a short happen there will be no room for the battery to drop when the spring normal would collapse.
The IMR will give a much better kick than the ICR for LR 1.5Ω attys but for 1.8-2.0Ω offerings I see the ICR being perfect. I also like the extra time I get from the ICR as detailed in the accompanied graphic. The crossover in voltage level giving the benefit to the ICR happens at just the 218mah point in the total life cycle(750mah)using just a .75a load.
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