What Cables And What Power Bank For Milwaukee Heated Clothing?

My wife and I both have some Milwaukee heated clothing (jackets & vests). The OEM Milwaukee M12 batteries are okay, but we are looking for power banks and cables that will work with them.

What power banks should I consider that have an "always-on" trickle charge/low-power mode?

I have seen that some power banks have DC5521 ports on them. Are they are better choice than USB-C in this case?

What cable(s) should I consider?

A Google search shows this AI Overview:

To use a standard USB power bank with your Milwaukee Heated Jacket, you will need a 12V step-up cable (like a USB-C/USB-A to 5.5mm barrel plug). This adapts the power bank's 5V output to the 12V your jacket requires.

Here is exactly what you need to do to make it work:

Get the Right Cable: Purchase a USB to 12V Step-Up Adapter Cable (widely available on platforms like Amazon). Ensure it supports Quick Charge (QC) 3.0 or Power Delivery (PD) so it triggers the required 12V output.

Check Your Power Bank: Use a high-capacity power bank (at least 10,000 mAh to 20,000 mAh) that supports fast charging protocols.

Connect and Power: Plug the barrel-jack end of the step-up cable into the jacket’s power pocket and the USB end into your power bank.

Pro-Tips for this Setup:

Power Saving Mode: Forum users on CandlePowerForums indicate that many power banks have an "auto-shutoff" or sleep mode triggered by low-draw electronics. If your jacket turns off on its own, you may need to look for a power bank with an "always-on" trickle charge/low-power mode.

Milwaukee Adapters: If you want to use standard Milwaukee M12 or M18 tool batteries, you can easily use their dedicated Milwaukee M12 Power Source without needing any aftermarket USB adapters.