jweavers; just an observation here. In your last post you mention getting a RM2 fitted for a mini. Done that. I carry a 14500 mini and a 2.1 mini to work everyday. It is my opinion the 2.1 is an upgraded version of the mini. The larger battery makes it though the 12- 16 days and your rba does not have to be modified. I believe the mini 2.1 is better, though I keep the old mini around too !