Same issue here. Bought HP battery from iFixIt here, [guide|110005]
It would not boot up even with the usb-c power adapter connected to an outlet. However, it would power on with same setup with the old nonfunctional battery and with no battery install. Strange that it would not work with the new battery installed. I suspect that the one I ordered from here that’s HP brand and no after market is faulty. Still trying to get iFixIt to respond back to my email and get some traction on the issue on this replacement battery.
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=== Update (01/19/2022) ===
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UPDATE! Finally got the replacement from iFixIt. Did the replacement install. The replacement worked like a charm!! Yes, it was the battery connection cable on the first ordered battery. The only difference I could visually tell is the battery power connector cables was better soldered on the recent replacement than the first one that was shipped to me. The HB brand from iFixIt solved my battery issue. Tested ... it's fully charge and I'm writing this on it!! Cheers!
Same issue here. Bought HP battery from iFixIt here, [guide|110005]
It would not boot up even with the usb-c power adapter connected to an outlet. However, it would power on with same setup with the old nonfunctional battery and with no battery install. Strange that it would not work with the new battery installed. I suspect that the one I ordered from here that’s HP brand and no after market is faulty. Still trying to get iFixIt to respond back to my email and get some traction on the issue on this replacement battery.