Metric Halo 2882 operating guide - Manual (Page 28)

Mobile I/O User’s Guide
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If you find that the computer is not capable of powering Mobile I/O or does
not provide enough run time, you may want to explore using an external
power source with the Mobile I/O. Check with Metric Halo for details on
different battery power solutions for Mobile I/O.
As with all electronic devices, when connecting an external power source to
the Mobile I/O, you should first connect the power source to Mobile I/O
while it is in an unenergized state (e.g. not connected to the mains or
switched off). After the connection to Mobile I/O has been made, you should
energize the power source.
If you connect an energized power source to the Mobile I/O’s 2.1mm power
connector you may see a small spark when you make the connection. This is
due to surge current and is normal if you connect a power source in this
way. While this will not damage the Mobile I/O in any way, to avoid the
spark just connect the power connector to Mobile I/O before connecting the
power source to the wall.