FlightScope X3, User Manual

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SYMPTOM POSSIBLE CAUSE & REMEDY
Unit does not switch on Make sure that the battery is charged, or
otherwise connected to a main power source
with the AC adapter.
Make sure the leg is extended.
Low battery run time Rechargeable batteries lose capacity over time.
If your batteries have become too poor to use,
contact FlightScope Support for a new battery.
Batteries run down Make sure to charge batteries for 8-10 hours
until full.
When stored for a length of time, batteries will
lose charge due to self-discharge. If a unit has
not been used for a while, it is recommended to
first charge the batteries or run it with the AC
power adapter.