Pentax D-LI90 DC power supply using D-L109 dummy

I have been searching for an affordable way to power the Pentax K-01 using a DC power supply via a dummy battery. The original OEM one is too costly and I could not justify the expense.

But thanks to this thread: https://www.pentaxforums.com/forums/138-pentax-k-01/438496-ac-adaptor-k-01-solution.html#post5769773, I learned that the Pentax D-L109 dummy is also compatible with the K-01 (and possibly with other cameras that share the same D-LI90 battery - but I have not tried).

So I bought this particular D-L109 dummy battery from this seller on Aliexpress.

The listing is called: "Power Bank 5V USB Cable Adapter K-AC128 D-DC128 DC Coupler D-LI109 Dummy Battery for Pentax K-70 K-50 K-30 K-R K-2 K-S1 K-S2" and the seller is "TUSAR Camera Accessories Official Store"

https://www.aliexpress.com/item/1005004568475973.html?algo_pvid=ba7d294d-e5a6-47fc-b2a4-ee5fb830cc9b&algo_exp_id=ba7d294d-e5a6-47fc-b2a4-ee5fb830cc9b-3&pdp_npi=3%40dis%21AUD%2115.92%2115.92%21%21%2177.16%21%21%400b0a558a16894159253182791d077a%2112000029657353518%21sea%21AU%21118575942&curPageLogUid=Y0LYGMVcKY3k

It is powered by USB so effectively the K-01 (or the K-30, K-50, etc) can be powered by a power bank that is commonly available for charging phones.

The important bit of information as shared by the pentaxian Kypfer is to cut a small notch on the D-L109 dummy to resemble the D-LI109. I did so carefully as the dummy battery is actually hollow inside.

Next, I modify the pentax D-LI90 battery created by BETLOG to create a "shell" for the D-LI109 dummy battery such that the entire assembly can be inserted into the K-01 properly. In this way, the D-LI109 battery is not "loosely" inserted into the K-01. Refer to the attached photos.

I am pleased that the whole thing works.

note: not all power banks work with the dummy battery however - I have 2 x ROMOSS power banks but only one of them works. The other doesnt seem to power up the camera.

Hope this is useful to a pentaxian still using the K-01.