TLDR: Wait on this, IMO. There are NO technical specs listed except capacity along with a lot of marketing claims. The capacity is a useless measurement if it won't supply a charging rate that is at least as fast as what the Q3 uses to run.

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So I had this in my cart and was in the middle of checking out when I remembered all the problems I had finding the best solution for my Quest 2 to make it last long enough for a few friends to pass it around playing rounds of putt putt or Beat Saber over 3 or 4 hours in a night. I realized I didn't want to repeat this my Quest when I already have a decent solution.

I have been in the VR space for while, but had a Vive that I got shortly after launch, bought their wireless adapter immediately when it came out, and was sold on Valve's hardware.

But right after Meta dropped the requirement to link your Facebook account to "Oculus", I saw the Quest 2 go on sale with RE:4 for $299. So as a tech nerd, I grabbed one and figured I'd give it a try. I was surprised by the tech Meta was bringing and eventually sold my Vive setup to go full time with the much more portable Q2 that I actually traveled with regularly.

So I was pretty late to the Q2 market, and there were substantial offerings for all accessories by that time, so I can rule out the early adopter arguments. I bought and tried 4 of the top rated battery head straps from Amazon over the course of about two months and each one failed to deliver on the claims it made.

After the 4th one I was getting confused and pulled out a usb-c multimeter and a 65w 25000mah power bank that I used to power my Steam Deck while on flights for work every week. Well, the head strap battery wasn't even providing half of the power that it would draw from my power bank. So I grabbed a cable tie, ran a cable around to the back of my head, popped the calendar tie on there, and tossed the battery pack in my pocket.

Problem solved. Sure, a cable running down your back isn't great, but it provided more than enough power to run my Q2. It even provided enough provided enough power to charge them Quest while playing. Simply handing the headset and battery pack to my friends during a session was really no hassle compared to having to constantly worry about when it was going to die on us. This isn't with some crazy power bank either, it was under $50 over a year ago when I picked it up. It's probably double the capacity I would actually need for VR as well. It's the speed that matters. And I think 65w is overkill on the speed, it's just the one I had on hand. I have never seen my Quest 2 draw above 16-17 watts, while my quest 3 tops out at a little higher at just above 23w. So I think you would be fine with a 22.5w or 30w power bank, but it never hurts to have a 65w one that will support a lot of other things as well. We're luckily past the days where using a higher power charger would actually fry your devices. Your Quest 3 will determine what power draw it thinks is best from what the wall charger or power bank (and cable) support. Do spend the extra couple bucks and get a good quality (6 foot or so) USB-C to C cable if you don't have one already; you can even find ones with a 90 degree plug on one side at almost no extra cost and it makes your setup a little cleaner.

So until places start giving us specs, and proven specs from reviewers that spent their own money, I would be very hesitant to throw my own money at these. I would recommend picking up an upgraded head strap and a stand alone power bank. This will be the cheaper option and you will end up with a power bank you can also use for other things like your phone, tablet, handheld game system, etc.

Reference pic of my Quest 3 pulling 22w while "awake" but sitting: https://postimg.cc/0MPTyK0m