The BT Shop is currently offering the Charge 3 for £74, reduced from £84. The Charge 3 launched in October 2018 at an RRP of £129.99. The water-resistant Charge 3 offers a strong 7-day battery life, heart-rate monitoring and sleep tracking. See our full Fitbit Charge 3 review to see why we have it 4.5/5 stars. Head to BT now to pick up the Fitbit Charge 3 for £74. Somrata researches and writes about the best tech deals to help readers make smart, informed buying decisions. She’s an expert on accessories and also reviews laptops, phones, audio and other devices.