S5 constantly getting 'Check Battery Cover' message after 4.4.4 update

Yes!  Same problem here after updating to 4.4.4.

I am using the wireless charging cover.  I can try with the normal cover, but I don't think it will help, because AFAIK there are no sensors to check whether or not the cover is attached properly.  The messages are purely software driven (normally the software generates the message after the phone has been powered on from being completely off).

I have tried removing my SD card and it didn't help.

I don't seem to get the message every time, but often enough to be annoying.  And what's worse, is once I dismiss it once by touching the screen, it generally pops up again immediately.

Just to put to bed the idea you need a new  SD card. I replaced my SD card with a SAMSUNG PRO 64GB and I still am seeing the message. Can we now get this fixed???

I switched to my standard cover yesterday morning.  I got the check battery cover message once since then.  So maybe there is some dependency on the charging cover with this message.  Was there sufficient testing done with charging covers and this update?

I found this on your issue but could not post the link as it describes how to fix the problem with rooting.

How to Disable Those Annoying "Water Damage" Popup Reminders on Your Galaxy S5

One of the coolest features of the Galaxy S5 is its IP67 certification. This means that the S5 is internally impenetrable to dust and can be submerged in water for thirty minutes at a depth of one meter. It's definitely a handy feature for folks who've lost a phone to a toilet in the past.

In order to absolve itself of responsibility in situations where the user didn't follow instructions, Samsung has integrated a set of popup messages into the S5's firmware. These popups, which show on startup and after you've disconnected your charging cable, inform you that you should check the back cover or the charging port to ensure that they are secure.

Sprint and Verizon variants of the Galaxy S5 offer the user an option to no longer show the message after it's been relayed a few times, but AT&T and T-Mobile models do not include this opt-out. If you're tired of seeing these messages like I am—or if you've removed your charging port cover and no longer care about the IP67 rating—there's a way around this nuisance.

Same issue here.

 - Frequent unexpected "check battery cover" popups

 - No SD card

 - Samsung wireless charing cover

 - Issue began with 4.4.4 update

I have the same issue.  I have had nothing but problems after this update, and this is one.  I tried rooting so I could disable the message, but I couldn't find anything that can root this version.  I'm not looking to replace firmware yet, but this is starting to really irritate me.  It is completely random when it pops up.

Wireless charging cover too.   Frequent "check cover" pop ups began with 4.4.4 update.

Didnt happen for months prior (except after cold boot).

While trying to troubleshoot this issue, I found a post mentioning that the method of re-installing the battery cover is very precise.  With nothing left to lose, I removed and re-installed the battery cover using the following steps -- and haven't had the issue return for a couple of days:

1)  Remove the battery cover

2)  Place the device face-down on a flat surface (like a notebook on a table)

3)  Ensure the cover and the phone back are both free of any lint or dirt

4)  Firmly press the cover on the top left and right corners

5)  Firmly press the cover just to the left of the flash

6)  Firmly press the cover on the left and right sides, halfway down

7)  Firmly press the cover on the left and right sides, just above the speakerphone cutout

😎  Firmly press the cover on the bottom edge, just above and to the sides of the charging port

Then, press firmly down all over the case repeatedly until you are absolultely sure it's as snugly installed as possible.

Let us know if this fixes the problem for you too!