Would a Pixelbook with 80% battery health be okay/safe to buy used?

It's still cosmetically perfect, tho I am concerned about the battery. Anyone have similar level battery health on your current Pixelbook now? What's it like at 80% health and below? The used model I'm looking at is an i7 512GB SSD version with 80% battery health. Is it worth it at $500 with pixel pen included? As long as battery does not have major issues, I'm fine with it. But is 80% and below major?