We have been looking at mounting URs on mobile robots (MiR or Adept) and I am curious if anyone here has experience with this. What kind of battery life have you been able to get? We've been considering disabling the UR's motors when not in use to conserve power, but turning the brakes on and off frequently seems like a good way to significantly reduce joint life. 

@MKarabin a UR5 typically draws about 2-3 amps in normal operation and could potentially reach approx. 8 amps if all joints were moving full speed at max payload. The MiRs battery capacity is rated at 40 amp-hours, 24 volts. From my experience with mounting URs on MiRs is that the battery life is usually cut in half from 15 hours to 7-8 hours. You would need to look at which element would be using the most power and how often (e.g is the MiR and/or UR moving short distances and waiting for long periods of time, this will improve the battery life). In addition, you also have the option of adding a second battery to the MiR to power the UR if you needed to run for longer periods of time. I've attached the MiR100 UR Interface document to this post for extra help on integrating the two technologies.

FYI.. I do not think disabling the motors to conserve power would be beneficial.

in our case the consumption of the UR is very little compared with the energy consumption of the heavy carrier when travelling. Just a few amps. So we never measured it yet.
This year on a fair in Vienna the UR5 on top of ZELOS runs moving constantly more than 16 hours from a 48V 48Ah batterie set without recharging.
When the Robot is not in use I would create a robot parking position where the weight of the Robot arm is lifted, then the Joints needs less amps.