AF-5000 on back-up power

[larco]

If you are wanting to power up the EFIS on back up battery alone, hold the left lower button of the unit in for 2-3 seconds, release and then wait for the boot up

[jfeighny]

On the last couple of flights, after shutdown, Both of my 5600s are indicating low battery power (7 volts) and are shutting down.
EFIS battery failure/end of life (2015) build?
Thanks
JF

[larco]

Sounds to me like you may need to send the battery back to TCW for repair (3-4 years old?) but first I would check the TCW fuse (located on the side of the TCW box) even though it is probably ok since you see 7 volts. A call to TCW is what I would recommend.
Larry

[jfeighny]

I was able to ground charge the TCW by putting a charger on my aircraft, master ON, Avionics ON.
Shed some demand by shutting down the IFD 540, #2 radio, Auto Pilot, dimming the screens.
As usual, the original problem was operator error; trouble shooting a map/boot up issue without putting ground power on the system.
Map/bootup issue was also operator error....bad thumb drive data transfer.
jf