Note: This will also work with the Frankenquest DAS mod for the Oculus Quest. I do not believe you need to worry about Quick Charge 3 capability with the Quest so should have more battery choices available as long as they are the same size. I like to use the heavier Anker 13400 battery with the Quest as it makes a great counterweight for the front heavy Quest.
I created this HTC Vive Wireless battery holder for the DAS based on what I liked from 3 other battery holders on thingiverse. I wanted a holder that worked with both the standard HTC battery and the Anker Powercore Speed 10000 (and possible others). And I wanted the holder to be taller and the battery to sit lower on the DAS. I placed the holes on the front to be able to see the battery status lights on the Anker 10000. Its hard to see but there is a channel that the smaller anker battery slips/clips into in the bottom so that it doesn't wiggle in the larger area.
The velcro across the top holds the battery down and in place (especially holds the smaller Anker battery in its channel).
I also extended the part that attaches to the DAS so that it is as long as the battery holder part. This allows it to be printed standing on its side with less support. With no supports the top will have some drooping/stringing and some cleanup of that will be required. With supports there maybe some some residual support cleanup required.
I use strips of black duck tape to attach to the DAS. Could also use 2 zip ties or velcro or black electricians tape... but I find the duck tape to be the most secure and not create a bulge inside the DAS where it attaches.
Batteries that I have tested to fit: The Anker PowerCore Speed 10000 QC3 slips/snaps down securely in the bottom channel. The OEM HTC wireless battery (original one and the 21W for Vive Cosmos) fit perfectly and sit above the lower channel, The Luxtude PowerRapid 10000 QC3 will fit but needs to be angled with just one side in the bottom channel for the lights to show and be a good fit. The Anker 13400mah QC3 (this one is taller and the circular pattern of lights don't all show... also the QC3 one isn't very common that is required for the HTC Wireless adapter).
I used a piece of self adhesive loop velcro on the front of the adapter . And a self gripping velcro (hook and loop) cable tie slips through the slot on the adapter:
Print standing on its side and you can get by with very little support. Just the top inside edge needs support.
Took a little over 5 hours to print on my Flashforge Dreamer at .20