Woww! Niiicee! Glad for you! Now you can just enjoy because you have a great airtime. 
Can you tell me what was the voltage at the end of the flight without load?
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Are these batteries available to purchase in the US? I can’t find anything online about them.
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Hi, following the recommendations of maniaX, 84V
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Yes my friend, they have US warehouse.
Right, you cant find on shop these batteries, you need to contact by email for more informations.
If you have facebook, contact the Alex Liu
Glad you happy with your perfomance. Im having my doubts about these being solid state. I cant find any info on them. There is also some debate over “solid state” and how there is some wiggle room that some us that title.
Cheers
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I’m planning to buy those HRB batteries. When purchased directly from China, one cell cost 30k russian rubles (about 350$). Maybe there is a way to order batteries from China directly HRB 40000mAh 5C 6S 22.8V Semi-solid battery Customizable – HRB-POWER
I have the same motor, can you share model for prop mount please? Want to order that on factory as well
Dont buy that fake solid state batteries.
Is a homemade aluminium prop mount.
why? I flight my drones on hrb batteries, they look quite good, not as high-current as tattu, but fine. Are they bad?
I guess that you are flying standard hrb lipos, we are talking about solid state batteries, I dont believe on that, probably fake semi solid state batteries from hrb and others brands 
Buy it and share you experince here in the forum 
Their math does not add up, they claim 40Ah x 22.8v = 912wH in a package weighing 3.89kg, that ends up being 234wh/kg but their spec says 546wh/kg. Buyer beware.
22.8v is a storage voltage, lipos charge to 25.2v and I usually discharge at 21.5v (30%) copter batteries for bigger battery lifespan. 40000 * 24 * 4 (packs in sequence) = 3.84 kw at 15.6kg (+ bms, wires, case) - about 17kg. Motor is 3kg, prop 450g, esc 500g. 21kg without frame
Not disputing your data but the total weight for your 3.8kwh pack is approximately the same weight ratio as the Openppg 2.6kwh pack. The energy density is about the same, not anywhere near the specs they claim of 546Wh/Kg which should make your pack batteries only weigh 7.1 kg.