If out of warranty, it costs $120 to replace a full WHOOP unit (strap + sensor), $176 to replace an AUS WHOOP unit, and €100 to replace a EU WHOOP unit, all of which includes a new battery pack.
It costs $30 to replace just the battery pack out of warranty.
WHOOP sells replacement bands on the WHOOP Store.
To replace a WHOOP band:
- Connect the new band’s hook to the clasp of the Strap.
- Thread the other end of the band through the top of the inner slot of the Strap (i.e. the slot closest to the Strap’s sensor).
- Feed the band back up through the outer slot so that the end of the band is overlapped on top of itself.