You have same behavior like my L14, nothing wrong with L14 it’s just a different charging tactic to completely preserve Battery and PCB life.
If you want fully charged the battery of L14 just do it on sleep mode.
Oh i love my Librem 14, just would love it at least charge to 80% of battery capacity and then it stop. My thing is how long it takes to charge, i travel a lot and sometimes need that battery for when i cant get to a socket to power it.
Believe me I love my L14 too. 
Of course you can stop on 80% if want but it’s not really necessary because Purism is already implementing battery preservation modes.
Examples: stoping on 80% it one mode. like accelerate the charge between 20 to 80 and then slowly down to 100% is second mode of charging. there are more.
The issue i’m having is how extremely slow the charging is… like all day to charge the battery while its off… I can’t use the machine to charge the battery… which… is difficult.
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I know what you talk about so on EC Firmware v1.5 you can see the improvement of charging even if the L14 it ON, but in that firmware version v1.5 there is a bug which the PCB burn and stop working suddenly so i guess that Purism tries to find out the origin of that failure to the point that in EC version 1.7 the charging is very slow but this is only for security to prevent the L14 permanent dying suddenly by a charging error.
You can use the L14 at any moment if DC is plug-in the only different is that that batteries not get charging not matter what percentage of battery it is. I guess that this slow battery charging could be change in the incoming ec version.
So wait this EC version 1.7 fixed the issue with the charger killing the laptop? Hence why the slow charging and times at when it can charge correct?
that is categorically false
I just try to unabstract to user. 
Of course you the master.
May be fixed. But the think is that regular-user are bad experiment with the L14 like Adding a second SSD to Librem 14 then theys kill the L14 then later calling to Purism for a L14 PCB failed so this is not fair to Purism
Because the team reduced the energy entrace, so just budget to keep the L14 ON, not for charging battery on demand so that is why i guess the estimate time for charging is crazy. 
But nothing to stress to much with e.c v1.7 for extremly low charging, because when the L14 has fully charged you can uses all day then in the night time the L14 charged to full overnite.
To be honest i not using my L14 ATM not because I’m afraid to use it my L14, it’s because i uses the free software X200 computer too, so my L14 is saved for now.
So the battery charged up to 100% . When plugged in, started playing a 4k video and the battery percentage drops… that normal?
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Depends on how fast it drops.
of course, since the charger isn’t going to kick back on until the battery drops below a certain threshold (which is user configurable)
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Of course that does not normal conduct. I not tested EC v1.7 and i am new user for L14 i do not know how the EC it programmed really to charge the battery. if @MrChromebox can explain us should be
nice.
Makes sense to me! Thank you!
SOLUTION: Updated the EC firmware to 1.7. Reset the power to the EC by unplugging all power including the battery from the motherboard. Adjusted the thresholds for charging to better config.
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So after resetting the charging going up?
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Im going to be using the system a lot more and stressing out the laptop with my workflow. I’ll update the thread with the results.
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But shouldn’t the charger supply power to the L14 without any power going to the battery?
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depends on how the power delivery system is designed
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e.c v1.5: The last 2 week i used my L14 to convert a movie from one format to another so L14 was like 2 hours of full cpu intensive use, i didn’t liked too that the L14 was quite hot and the fans at moderate speed, when the fans should have been at full speed to cooling down the machine. : (