Logitech UE ROLL 533-000122 Replacement Battery 3.7V 2200mAh

Logitech UE ROLL / WS600 Series — 3.7V Li-ion Replacement Battery (533-000122)

This 3.7V 2200mAh Li-ion cell replaces part number 533-000122 in the Logitech UE ROLL and WS600 series portable Bluetooth speakers. It fits the WS600, WS600BL, and WS600VI variants alongside the standard UE ROLL. Swap it in when the original cell no longer holds a charge or the speaker shuts down well before the indicator reaches empty.

• UE ROLL and WS600 compatibility: All models in this group share the same flat cell footprint, connector pinout, and BMS handshake voltage. The 67.03 × 21.52 × 18.50mm cell slots into the same bay across each variant without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the UE ROLL platform and confirmed the BMS accepted the cell, reported charge state correctly, and held voltage under combined amplifier and Bluetooth radio draw without triggering a low-voltage cutoff prematurely.
• Discharge cycling for the UE ROLL: The UE ROLL spends most of its life sitting charged between uses. Let the cell drain below 20% at least once a month before recharging — constant top-off charging without a full discharge cycle causes fuel gauge drift and accelerates capacity fade on the Li-ion cell.

Why the UE ROLL cuts out at high volume even on a fresh charge

At maximum volume the amplifier draws a sharp current spike at the same moment the Bluetooth radio is transmitting. On a degraded cell, that combined load pulls the terminal voltage below the BMS cutoff threshold momentarily, and the speaker shuts off or drops the Bluetooth connection. A new cell with lower internal resistance handles the spike without the voltage dip that triggers cutoff. If you see drop-outs only at high volume and not at moderate levels, this is the cause — not the speaker hardware.

Speaker reports full charge but audio distorts before the indicator hits empty

This symptom points to voltage sag from a worn cell, not a software glitch. As internal resistance rises with age, the cell's terminal voltage drops under load even when the resting voltage still reads high — the fuel gauge sees the resting voltage and reports a full pack, but the amplifier sees a sagging rail under draw. That sag causes the amplifier to clip before the indicator reaches critical. Replace the cell and the resting voltage and load voltage will realign, clearing the distortion.