MB3766 DC power output shuts off after a short while

The MB3766 is a portable jump-starter and power bank that features a barrel-plug socket that can supply power from 12-16v to your devices. 

To activate this feature, plug your 12v device into the cigarette socket adapter, connect the adapter to the jump-starter, and press the grey power button.

The unit will light up the display and show the current charge state.

Note that the unit has a low-load shutdown feature which will turn the power to that socket off within 20 seconds if it detects that your device draws less than 0.2A.