sv-bat-320 unavailable

[PTJ]

I've owned my very low time RV-14 for about 20 months. The HDX system has performed without issue until two flight ago when my right-hand screen gave me a CAUTION - BACKUP BATT UNAVAILABLE along with BACKUP BATT TEST NEEDED. With a fully functional left-hand screen I flew a local VFR flight for over an hour but the CAUTION never went away. I went into the setup menu and the BACKUP BATTERY STATUS page.
The page shows:
BATTERY CONNECTED (SETTING): YES.
LAST BATTERY SHUTDOWN: ABNORMAL
BATTERY STATUS: 00.00V
CHARGE STATUS: MISSING/FAULT
I've been looking through the Installation and User Guides but haven't found anything that speaks to this.

Any help appreciated,
PJ

 

[Rhino]

Did you try running the test? Sounds like your batter may be bad.

 

[PTJ]

It won't test which makes me suspect a bad battery.

 

[jakej]

PTJ - You could swap the battery with the known good one on the other screen - ie ‘suspect’ battery goes To the good screen.
Connect a battery charger to the airplane
Turn on the battery master switch & turn off all unnecessary electrics but leave the main screen (with the suspect battery) on for say 4+ hrs
Then check the backup battery status. If the result is still bad then most probably there is a battery fault or it’s 3 wires/connector at the battery.
Or there may be (unlikely IMO ) a problem with the 2nd screen. Let us know how it turns out - It could be helpful for others who may experience the similar symptoms