How long does the battery last on my Wireless 2.4GHz Headphones after a full charge? The battery will last approximately 5 hours after a full charge. Related articles Why was I charged for Kogan First? Kogan Waterproof Sports Earphones - (KASPORTSEPB) - Manual My Kogan Wireless Headphones Will Not Turn On Kogan F2 Pro True Wireless Earbuds with Metal Carry Case - KATWSF2PMEA - Manuals and Support Why isn't the Headphone Jack Working on My Phone?