I did some google search, and google came up with capacity of 60 Amp-Hours at 12 V for a standard battery.
12 V x 60 Ah = 720 Watt-Hours, which could power up my desktop with a monitor for a good 2 hours lol.
Should a spare battery be installed, that would double the capacity of the batteries. I dunno what the equipment draws, but my estimates (with help of google)
LIDAR - 5 Watts
Radar Decatur GVP-D Genesis VersaPak Directional Radar Handheld Cordless Police Radar Gun w/ K-Band Directional Antenna & Faster Mode 8 volts at 370 mA (max) = 3 Watts
Laptop Computer - 120 Watts (maximum, I doubt they use the laptops with crazy hardware to draw more than 90, but who knows...)
Radio - 20 Watts
Whatever they use for laptop communication with the server - ? (another 20 watts?)
So, that is altogether 170 Watts, or 4 hours of continuous use of all 5 devices. Halve that time to only discharge the battery to a half, and there is still 2 hours of use.
Any thing I might have missed (coffee warmer)?