OK, I did a bit more research about the M1 cells and found this bit of information from
here (scroll to about 2/3 the way down under the heading "A123 Systems - DeWalt 36v"):
Code:
nominal voltage 3.35v
max voltage 3.6v
capacity 2.2ah
internal resistance 10-12mohm
power density at 5 sec pulse 3500w/kg
Continuous discharge 30, 189W, 2,700 W/kg
Long pulse 80, 240W, 3,480 W/kg
Instant pulse 100, 344W, 4,990 W/kg
energy density 110wh/kg
weight 70g/cell
Reading a little further, it seems these are the "EV" sized cells, whatever that means.