How to kill a battery

Here’s the situation. This is a 4.5 year old 2020 MBP Intel i5 13” 4-Port. The battery now will rarely last over 2.5 hours, and that’s only if I turn off all wireless connectivity to the device. Took it into an Apple Store the other day, and was told since the battery health is 82%, they couldn’t do a straight battery swap until the health level got below 80%. Only thing they could do at that point was replace the entire bottom half of the machine for $800 CAD plus tax. The lady at the Genius Bar suggested I try and degrade the battery faster, so I can just get the battery replaced. What are some of the best ways I could do that?