Soundcast Outcast OCJ411a Compatible Battery 14.4V 3400mAh

Soundcast Outcast OCJ411a / OCJ410 — 14.4V Li-ion Replacement Battery (OCJLB)

This is a 14.4V 3400mAh Li-ion replacement battery for the Soundcast Outcast OCJ411a, OCJ411a-4N, OCJ410, and OCJ410-4N portable Bluetooth speakers. It replaces OEM part numbers OCJLB and 2-540-003-01. When the original pack starts cutting short or refusing to charge, this swap restores full wireless audio operation.

• OCJ410 and OCJ411a series compatibility: Both model variants share the same 14.4V battery rail, connector footprint, and BMS handshake requirements. The pack dimensions — 73.56 × 69.80 × 18.68mm — match the original battery bay, so no modification is needed to seat and latch it correctly.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the OCJ411a platform. The BMS communicated correctly with the charger, accepted a full charge without tripping into protection mode, and delivered stable voltage through high-volume audio output where amplifier current draw peaks.
• Monthly discharge cycle for OCJ411a users: The OCJ411a is typically charged on a desk before every outing — constant top-off charging without a full discharge causes fuel gauge drift. Let the speaker run down below 20% at least once a month before recharging to keep the cell capacity reading accurate and slow cycle degradation.

Audio distorting before the battery indicator reaches empty on the OCJ411a

As a Li-ion cell ages, its internal resistance rises. Under the combined current draw of the amplifier and Bluetooth radio, voltage sags faster than the indicator expects. The speaker's amplifier clips when supply voltage drops below its operating threshold — that clipping is the distortion. The indicator still shows one bar because the fuel gauge is reading a resting voltage, not load voltage. If you hear distortion before the low-battery alert, the original pack has degraded past the point of reliable use.

Bluetooth dropping specifically at high volume on the OCJ411a

Cranking volume past 80% forces the amplifier to draw a sharp current spike. On a worn pack, this spike pulls the cell voltage low enough that the Bluetooth radio — which shares the same supply — momentarily loses power and drops the connection. The speaker may reconnect within seconds, making it look like an interference issue. It is not. It is voltage sag under combined amp and radio load. Replacing the battery eliminates the sag; confirm the replacement is fully charged to 14.4V before testing at high volume.