Results 1 to 4 of 4

Thread: Odd internal battery charge status

  1. #1

    Odd internal battery charge status

    Hi AFS,

    I experienced an odd charge status of the internal Li-Ion battery yesterday. After a 1.2 Hr flight, I shut down in front of the gas pumps to fill up. Everything was powered off for the 13 mins it took to refuel. When ready to startup, I press Btn-1 to boot the EFIS and view the startup checklist as the 4500 is wired to the e-bus. I was immediately presented with a 'low battery - unit will shutdown' style mesg. I then used the POH to go through the startup checklist and taxied to the hangar (~2-3 mins) with everything on. After shutdown, the EFIS remained on for a minute or so (until I held Btns 1 and 5 to power off).

    I've looked at the EFIS data and it confirmed that the EFIS was receiving ~13.5 VDC the entire time. There's a small bat_volts dip, from 8.4 to 8.2 VDC, which I can't explain. I believe the small spikes on the 'volts' line to be related to me operating the flaps and the wig-wag landing lights.

    Name:  volts.jpg
Views: 323
Size:  20.0 KB

    Any ideas/suggestions as to why after a 1.2 hr flight the EFIS had a "dead battery" but after a 2-3 minute taxi everything was Ok?

    Thank you,
    /\/elson

  2. #2
    It looks like when it turned on on battery power it thought the battery was too low and decided to shut down. If it happens again try turning on the master switch to see if it resets the battery reading.
    Rob Hickman
    Advanced Flight Systems Inc.

  3. #3
    Hi Rob,

    Will try out the 'Master' to ON then OFF to see if that offers any clues.

    On a similar note, I noticed the other day that after a 2.8 hr flight and gassing up, then booting the EFIS on internal battery and increasing DIM to 100, the battery charge indicator went to zero and the unit shutdown. A subsequent reboot of the EFIS and leaving DIM at 50 (the default, if I recall) the unit ran just fine for checklist/startup. Does the display brightness put that much of a load on the internal battery? Firmware is 8.06.08 on a 4500.

    Thank you,
    /\/elson

  4. #4
    We automatically dim the screen to 50% on internal battery to make it last longer, if the battery is low and you turn the screen up to 100% it will shut down faster.
    Rob Hickman
    Advanced Flight Systems Inc.

Similar Threads

  1. Charging the Internal Battery
    By timotb in forum AF-3400s, AF-3500s, AF-4500s ... General Discussion
    Replies: 7
    Last Post: 04-10-2014, 11:01 AM
  2. Can the AF-5600 USB be used to power/charge Iphone/Ipad?
    By morristull in forum AF-5600 & AF-5500 General Discussion
    Replies: 1
    Last Post: 05-29-2012, 02:53 PM
  3. Oil/Fuel PSI only seem to work during internal battery ops
    By dnelson in forum Engine Sensor Installation Questions
    Replies: 0
    Last Post: 03-23-2011, 09:20 PM
  4. What's in charge
    By Wrgway in forum AF-3400, AF-3500 ... General Discussion
    Replies: 8
    Last Post: 09-15-2010, 06:38 AM
  5. Internal Battery
    By NoahF in forum AF-3400s, AF-3500s, AF-4500s ... General Discussion
    Replies: 7
    Last Post: 04-08-2010, 04:15 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •