Plantronics CS60 Replacement Battery 3.7V 180mAh Li-Polymer B511007

Plantronics CS60 / HL10 — 3.7V Li-Polymer Replacement Battery (B511007)

This is a 3.7V, 180mAh Li-Polymer battery for the Plantronics CS60 wireless DECT headset and the HL10 handset lifter accessory. It replaces OEM part numbers B511007, 452128, and 6535801. Swap it in when the original cell no longer holds enough charge to get through a standard call session.

• CS60 and HL10 compatibility: Both devices share this cell format — same 3.7V rail, same 30 × 19.70 × 4.00mm footprint, and the same BMS handshake protocol the base station uses to confirm a recognised pack before enabling the charging circuit.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the CS60 base station. The BMS completed its handshake without errors, the charging indicator behaved normally, and the pack reached a stable 4.2V terminal voltage at full charge.
• First charge in the base station: Dock the headset in the CS60 base immediately after fitting this battery and let it run a full charge cycle before taking any calls. The base station needs that initial cycle to log the new cell — until it does, the talk-time indicator will not read accurately.

Base station not recognising a freshly installed pack

The CS60 base uses a BMS handshake to verify the battery before it enables the charging circuit. A new cell shipped in storage-voltage state — typically around 3.6V — can sit just below the threshold the base expects on first dock. If the charge light does not come on or shows an error, remove the headset, wait 10 seconds, and re-dock. The base will retry the handshake and, in most cases, begin charging normally on the second attempt.

Headset cutting out mid-call on a new battery

The CS60 draws simultaneously from the audio circuit and the DECT radio transmitter during a live call. On a cell that has not completed its first few charge cycles, that combined load can pull the terminal voltage low enough to trigger the BMS low-voltage cutoff. The headset goes silent — not because the battery is faulty, but because the cell has not yet reached its rated capacity. Run three to five full charge-and-use cycles and the cutoff threshold will stop being hit under normal call load.