The 450mAh lithium-ion cell delivers 57 hours of wireless playback — enough for a full work week of daily 8-hour commute + office sessions without recharging. This is one of the longest battery lives in the wireless on-ear category at this price, making the Tune 520BT a reliable option for users who regularly forget to charge their headphones overnight.

Five minutes on USB-C restores 3 hours of playback — enough to cover a morning commute from a short plug-in while getting ready. Full charge from empty takes approximately 2 hours. USB-C is universal, so any standard phone charger or power bank charges the headphones without carrying a separate cable.

JBL's Pure Bass tuning emphasizes deep, punchy low-end response — the sound signature JBL has built its consumer reputation on across decades of speakers and headphones. The 33mm dynamic drivers cover the full 20Hz–20kHz range at 102 dB SPL sensitivity, meaning they get loud from low-power sources including phones without requiring high-volume settings that drain battery faster.

Bluetooth 5.3 offers improved connection stability and lower power consumption compared to 5.0 and 5.1 — the difference is noticeable in crowded wireless environments like offices and public transport. Multi-Point keeps two devices paired simultaneously: audio from the active device plays, and an incoming call on the second device interrupts automatically without requiring manual switching.

The JBL Headphones app (iOS and Android) provides a customizable EQ to adjust the sound profile beyond the default Pure Bass tuning — useful for those who prefer a flatter, more neutral response for podcasts and calls. Voice prompts can be set to different languages, and the app surfaces firmware updates and battery status in one place.

At 157g the Tune 520BT is among the lightest wireless on-ear headphones available — lighter than most full-size over-ear ANC models by 80–100g. The foldable hinge collapses the earcups flat for bag or backpack storage. No ANC means no additional circuitry weight — the Tune 520BT trades noise cancellation for maximum portability and battery life at a lower price point than the Live 770NC.