Can Dell Lattitude 5400 be charged over usb type c port?

@minhdcu  The specs say that it supports DisplayPort and "Power Delivery".  Unfortunately that's a bit ambiguous because USB Power Delivery can be used in either direction, either to allow the system to charge itself and/or to provide higher than standard USB power levels to attached peripherals.  Some devices only support USB PD in one direction or the other, while others support both.  That said, given that it's a 14" Latitude system that's designed for businesses and therefore docking stations, I think it's an excellent bet that it supports being charged over USB-C.  If you have access to a USB power source, there's no harm testing it out.  If you connect a USB-C charger to a system that doesn't support being charged, you won't harm anything at all.  USB PD requires the devices to perform a negotiation before any power flows, so if your system doesn't support USB PD charging, it won't perform that negotiation and therefore the power source won't provide power.

Assuming it does support USB-C charging, check the wattage of the power adapter that came with the system to find out what wattage level it's designed for, and then ideally make sure your USB-C power source supports at least that much wattage (higher is fine; the system won't use what it doesn't need).  Note that if the wattage is greater than 60W, you'll need to use a USB-C cable rated for up to 100W instead of the more common 60W max, because if you use a 60W cable, that's the most you'll ever get.  Also note that if you want to use a third-party charger, Dell systems I've seen thus far seem to limit themselves to drawing at most 65W over USB-C from non-Dell power sources, even if the power source supports more and the system would benefit from more.  I don't know why Dell does this, but I've seen it on multiple systems.  Technically you can use lower wattage power sources if necessary, but you can end up with behavior like slower battery charging and/or throttled performance if you do, so it's obviously not ideal.

It works, I tried charging via usb c port and it charges.

It indeed charges over USB-C port but i have one more specific question.

I tried charging dell 5400 over usb-c using AUKEY XD26 powerbank that claims to have Power Deliver 3.0. Unfortunately for some reason it does not work (note that usb-c on that powerbank is used both to charge the powerbank and also power output as well).

I am not sure if issue is because of powerbank deciding to draw energy from the cable when connected to PC (PC is also giving power as on every usb) or issue is somewhere else.

Did anyone succeed with charging Dell 5400 over usb-c with powerbank?

Just to be clear i used the same baseus 100W cable which i tested with powerbank with gan 100W charger and dell laptop charges over this usb-c cable completely fine with full power.

Small update.

After longer testing i can make laptop charge from powerbank, usually with prompt that is not full power (65w) as original charger but lower one (45W) but that is okay for me. Laptop is still charged just a bit slower.

The issue is i cannot make it charge every time. Sometimes i have situtation that powerbanks start to trying to charge itself FROM the laptop, then goes off (seems like stop charing from laptop) and after a second again over and over.

Sometimes when i unplug it and plug again it starts charging laptop properly.

It seems that is random and you are never sure which time it will work. I already reported that to aukey and asked for tests on their side.  It seems  a bit stupid to manufacture same usb-c to both charge powerbank and as PD 3.0 output with no controll over drawing/providing energy from that port. Not sure somebody thought about this usecase but let us wait for their tests and reply.

To be clear i tested 3 different cables, one 100W usb-c <> usb-c cable that comes with powerbanks and two baseus 100W 2m cables as well. All both with powerbank and GAN 100W baseus charger.

Interesting case is when you will connect power to laptop from original charger during being charged by powerbank it still is charged by powerbank but when you disconnect 65W power again it seems to charge normally not slowly (can be bug with that indication cause powerbank shouldnt provide more than 45W)

@poweruserdell  You should be able to tell which direction power is flowing, because if your system doesn't show as charging, then your power bank should show as charging.  But the other possibility is of course that no power is flowing at all in either direction.  I personally have a RAVPower RP-PB201, which supports up to 60W output rather than your Aukey's 45W, and it also supports being forced to draw power rather than provide power if you ever want to force the power bank to charge itself from a laptop rather than charge the laptop (though that would be slow).  I don't have a Latitude 5400, but I have successfully used that RAVPower unit with all laptops I've tested, including a Latitude 7290, Latitude 7480, XPS 13 9350, ThinkPad X1 Extreme Gen 2, and ThinkPad T480s.

@poweruserdell  Some power banks do allow you to force one direction or the other for power flow, as I mentioned in my reply above.  However, if yours doesn't, it might be because they knew that laptops will typically only provide 7.5W or 15W output from their USB-C ports, and therefore charging a power bank from a laptop would be quite slow compared to charging it from a proper wall charger.

YES.

I have a 5400 and a DELL Dock that connects via USB-C. 

Dock supplies power to laptop via USB

@jphughan  i think you still do not understand the case. The issue is i cannot choose IF i want to charge from laptop or i want to CHARGE THE LAPTOP (what is completely possible using usb-c) instead i have to try over and over and after multiple tries i manage to get the direction of charge TO the laptop. Of course it is only 65W and laptop says the charger is slow but that is completely fine and expected and sufficient for me (aukey XD-26 spec says 45W).

This seems to result from the fact that in aukey XD26 the same usb-c port is both IN/OUT and noone though about such case.

I am curious if there is anything that can be done on laptops and to affect if the usb-c port draws power from the connected device or provides it (for example if detects power only no data on the usb cable). Such configuration would resolve the issue for me.

@poweruserdell  I don't know of a way to tell the laptop to force USB PD to run in a specific direction.  But I know that some USB-C power banks DO include that capability for this exact type of situation -- like the RAVPower RP-PB201 that I mentioned earlier.  When I connect that power bank to my USB-C laptops, it defaults to providing power to the laptop, but if I press and hold the battery status button for a few seconds, the power bank will switch to drawing power from the laptop instead.  But if your Aukey power bank doesn't have a feature like that, then I'm not aware of anything you can do on the laptop side to achieve the same end result.