Battery replacement that isn't a battery

I'm volunteering at a thrift store, and a Macbook Pro 15" from 2015 was collecting dust. The note on it said "Not charging, won't boot." I put Magsafe 2 into it, and sure enough it showed the low battery symbol and a lightning bolt. I figured that the battery was toast and ripped the battery out to try booting without one.

Our collection of Magsafe 2 chargers didn't have an +80W charger. I got my Magsafe 1 to 2 adapter and tried an 85W brick. It would get a quarter of the way through booting and then would boot loop back to the start. Seems that everything I was seeing of 15" pros can't run without the battery appears to be true.

My question, is there a way to take the existing battery board and attach something to it to give the laptop the oomph it needs in times like booting up, and can withstand being plugged in a lot? I'm not an expert on the circuitry and software involved in Macs charge by any means, but I figured that there would be people on here that'd know. Or know someone that knows.

My drive for this is that it feels like getting a good quality battery over and over again doesn't feel feasible in the long term for these machines. And it is definitely not cost effective for the places that people dump otherwise working devices on. I'd like to find an alternative if possible.