On a full charge, our headphones with the built-in lithium-ion rechargeable batteries (Harry’s & Joe’s) typically last 8-12 hours and our rechargeable transmitters last 5 hours. The batteries do last 500-1000 charge cycles - so if charged once a week should last 10+ years.
It is best practice to charge Harry within 7 days of your event to maximise charge. With the lithium-ion batteries, it's also best to avoid heat and optimise charge cycles. High temperatures can reduce the capacity of a lithium-ion battery and waiting 'til 0% power reduces the number of charge cycles available.
If you’re planning an event longer than 12 hours, we would recommend having 50% more headsets than the number of attendees, so they can swap over when they power down. Alternatively, we can provide you with some charging solutions. Feel free to give us a call on 0207 0603 653 or email firstname.lastname@example.org to discuss with our sales reps.