JBL Everest 700 Replacement Battery 3.7V 550mAh Li-Polymer

JBL Everest 700 / Live 650BT Series — 3.7V Li-Polymer Replacement Battery (P062831-02)

This is a 3.7V, 550mAh lithium-polymer cell for JBL wireless over-ear headphones, replacing OEM part P062831-02. It fits the Everest 700, Everest 300, Live 500BT, and Live 650BT. The cell matches the original dimensions at 30.48 × 29.95 × 6.64mm and connects directly to the headset's existing BMS circuit.

• Everest and Live series compatibility: These models share the same 3.7V single-cell architecture, connector pinout, and BMS handshake protocol — the headset firmware reads cell state from the same register across all four platforms, which is why one cell covers the range.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Live 650BT chassis. The BMS accepted the pack without a fault flag, noise cancellation engaged normally, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• First-cycle base station protocol: Seat the headset in the charging base and let it run a complete charge cycle before first use. DECT and Bluetooth headsets in this family log the new cell during that first full cycle — until it completes, the on-device battery indicator will not report charge level accurately.

Why the Everest 700 cuts out mid-call on a new battery

The Everest 700 draws from a single 3.7V cell simultaneously for the audio driver, Bluetooth radio, and active noise cancellation. During a call, that combined load briefly pulls cell voltage below the BMS trip threshold — the protection circuit interprets this as a low-cell event and cuts power. A new cell at storage voltage (typically around 3.7–3.8V) has less headroom than a fully charged cell at 4.2V. Running one or two complete charge cycles brings the cell to full capacity and raises that headroom enough to handle the combined draw without tripping.

Base station shows charging but headset shuts off after a few minutes of use

This happens when the base station registers surface voltage from the new cell without completing a BMS handshake — the indicator light goes green, but the cell hasn't received a full charge. The headset then starts at what looks like full charge but drops off quickly under load. Pull the headset off the base, power it on until it fully discharges, then reseat it and charge uninterrupted until the base indicator confirms a complete cycle. After that first full charge, resting cell voltage should read 4.15–4.20V before use.