About this replacement
CGV Prelude 3 — 3.7V Li-Polymer Replacement Battery (LD503046)
This 3.7V, 750mAh lithium-polymer cell is a direct replacement for the CGV Prelude 3 wireless headset battery. It fits the Prelude 3 specifically — not a generic headset pack. Swap it when the original cell no longer holds charge through a full call or audio session.
- Prelude 3 fitment: The Prelude 3 runs a single-cell Li-Polymer pack at 3.7V nominal. The LD503046 cell matches the physical dimensions (49.10 × 29.50 × 7.00mm), connector pinout, and BMS communication the headset expects. Any mismatch in cell thickness or connector orientation prevents the housing from closing and the base station from registering a valid pack.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the Prelude 3 platform. The BMS handshook cleanly with the base station on first insertion, charge current ramped correctly, and the protection circuit triggered at the expected low-voltage cutoff without faulting the charger.
- First-charge protocol for the Prelude 3: Dock the headset in the base station and let it complete a full uninterrupted charge cycle before making any calls. The base station logs the new cell during this cycle — skipping it causes the talk-time indicator to read incorrectly for the first several uses.
Base station not recognising the new pack after installation
The Prelude 3 base station handshakes with the battery's BMS before displaying a valid charge state. If the cell ships at storage voltage (around 3.6V), the base may show no charge activity or flash an error LED on first dock. This is not a faulty cell — the BMS needs a full charge cycle to initialise communication with the base. Dock the headset, leave it undisturbed through one complete charge, and the base will register the pack correctly.
Headset cutting out mid-call despite the base showing full charge
The Prelude 3 draws from two loads simultaneously during a call — the audio codec and the wireless radio. That combined current pull can cause voltage to sag below the BMS cutoff threshold if the cell is not yet conditioned. On a new pack, this typically resolves across three to five charge-discharge cycles as the cell reaches full capacity. If cutouts persist beyond five cycles, check that the base station contacts are clean and making firm contact with the headset charging pins — poor contact raises effective impedance and worsens sag.