Li-Ion Power Tool cells work great for RC!

[BrianG]

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"):

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.