Mini-X Installation, Setup & User Manual GRT Avionics
Revision A9 95
Battery Capacity Re-calibration
Beginning with Mini software version 2, there is a battery capacity re-calibration procedure that
can be done during annual maintenance. This will re-calibrate the battery meter so that its estimate
of the capacity remaining is more accuate.
1. The procedure must start with a partially or fully discharged battery. If the battery is fully charged,
(which is normal), partially discharge by operating the Mini from its internal battery for at least 20
minutes. To do this, apply power to the Mini, then remove power, and over-ride the automatic
shut-down message that will appear on the Mini.
2. After the the battery has been partially discharged, select the SET MENU, Display Unit
Maintenance, Battery Status, Capacity Calibration. (Pressing SAVE is not necessary.) Calibration
Status will indicate "Waiting for charge rate".
3. Apply external power and let the battery charge to 100%. Calibration Status will indicate "Waiting
for full charge" while charging. When the charge reaches 100%, Calibration Status will change to
"Measuring discharge".
4. When the calibration status changes to “Measuring Discharge”, remove external power and let
the Mini operate until it discharges its battery completely. When external power is removed, the
shutdown timer may appear. Stop the timer by pushing a button to prevent early shutdown. When
the battery voltage gets low, the Mini will record the capacity measured during the discharge.
5. Restore external power to the Mini so the battery can recharge. Battery capacity re-calibration
is complete.
Specifications:
Maximum Battery Operating Time: 1.5 hours or more at full brightness with a new battery at 72F
ambient temperature. Operating time is reduced at lower temperatures, with a partially-discharged
battery, and with aging of the battery.
Recharge Time : 2-3 Hours for a completely discharged battery.