SweatGuard Immersion Test Plan:
a) real world: listen to music outside in the 90+ heat until the battery dies. recharge and repeat for the 10 day heatwave that is coming.
b) more structured: place headphones in 6" of gatorade (while powered on) and agitate gently until battery runs dry. rinse, dry, repeat for 100 hours.
hopefully, the earphones still work after all that!