Charging Voltage

It's not uncommon to encounter issues with USB-C charging, and there could be a few reasons why your Inspiron 14 5430 is reporting a "Slow charger" despite using a USB-C multi-port adapter with a Dell 65W charger. Here are some potential causes and solutions:

1. Adapter Compatibility:

   • Ensure that the USB-C multi-port adapter is fully compatible with your laptop model. Sometimes, certain adapters may not communicate effectively with the laptop, leading to incorrect charging status reporting.

2. Firmware/BIOS Update:

   • Check if there are any firmware or BIOS updates available for your laptop on the Dell support website. Updates may include improvements to power delivery and charging recognition.

3. Cable Quality:

   • USB-C cables can vary in quality, and using a low-quality or damaged cable may impact charging performance. Try using the cable that came with your Dell 65W charger or a high-quality USB-C cable.

4. Power Profile:

   • Some USB-C chargers require manual adjustment of the power profile on the laptop. Check the power settings in Windows to ensure that it is set to receive the maximum power from the USB-C charger.

5. Dell Power Manager:

   • Install Dell Power Manager if it's not already on your laptop. This utility can help manage power settings and optimize charging performance.

6. Check for Charger Output:

   • Confirm that the USB-C multi-port adapter is indeed delivering the expected power output. You've mentioned measuring voltage and current, which is a good step. Ensure that the adapter is providing the correct voltage and current for your laptop.

Regarding the availability of a 65W power adapter with a 4.5mm barrel plug,I can find one here https://www.dell.com/en-us/shop/dell-45-mm-barrel-65-w-ac-adapter-with-2-meter-power-cord-united-states/apd/492-bbme/pc-accessories

If you continue to experience issues, reaching out to Dell's customer support or technical support may provide more specific guidance based on the unique specifications of your laptop model. They might be able to offer insights or even recommend alternative adapters that are fully compatible with your device.

That adapter likely consumes enough power of its own that you'll need more than 65W to run it when connected to the system.  The system ships with a 65W adapter, and needs that input to charge the battery and power the system at full speed.

If you'd rather use an OEM Dell adapter, these are standard Dell adapters with a 4.5 mm barrel connector:

https://www.parts-people.com/index.php?action=item&id=17629

We're having a similar issue at work where users are reporting 5420's - 5440's not charging using the OEM Dell 65 Watt USB Type C Chargers. 

Also, i'm not sure if I've seen a Barrell charger on anything Dell has put out in some time. Certainly not before the 5420's. The last I can remember was seeing them on the 5490's and 91's and maybe the 7400's which had both. 

Thoughts?

Correct, on the Latitudes -- but there are plenty of gaming (G-series) and Alienware models, along with the low-end Inspirons that use the barrel connectors.  So too do most of the docking stations.