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Weighing just 46 pounds ( 20.87 kg) the case can be taken underground; off road; up a ladder or lowered from a helicopter for lighting in emergency or repair situations.
The B version has an external charging port (for closed lid charging) and battery indicator along with two power output ports. Recharges in about 6 hours from full discharge.
NOTE: The above video is of the 9450 and many of the features have been improved in the 9450b