Sennheiser LBA 500 LSP 500 Pro Replacement Battery 14.4V 6800mAh

Sennheiser LSP 500 Pro — 14.4V Li-ion Replacement Battery (LBA 500 / 505596)

This is a 14.4V, 6800mAh Li-ion battery pack built to fit the Sennheiser LSP 500 Pro wireless speaker system. It slots directly into the LSP 500 Pro and restores full wireless operation when the original cell has degraded past usable capacity. Voltage and connector match the OEM spec — no adapters, no modifications.

• LSP 500 Pro platform compatibility: The LSP 500 Pro runs a 14.4V battery rail with a multi-pin connector that carries both power and BMS communication back to the base. This pack matches that voltage rail and pin layout, so the base station reads the new cell correctly and begins charge management as it would with the original.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the LSP 500 Pro platform. The BMS handshake completed on first insertion, the base station moved through its charge stages without error, and cell voltage held stable under combined amplifier and wireless radio draw.
• First-cycle base station registration: On first install, seat the pack in the base station and let it run a complete charge cycle before use. The LSP 500 Pro base logs the new cell's state-of-charge curve during that first cycle — skipping it means the charge indicator will not read accurately until the cycle is completed.

Why the LSP 500 Pro base station shows a charging error on a new pack

The LSP 500 Pro base station does not simply push current into the battery — it runs a handshake with the pack's BMS before entering charge mode. If the pack arrives at storage voltage (around 3.6–3.7V per cell), the BMS may not respond within the base station's expected window, triggering a charge fault indicator. This is not a defective battery. Remove the pack, wait 30 seconds, and reinsert it firmly until the connector seats fully. If the fault clears and the charge light begins cycling, the handshake completed — let it finish the full charge before use.

LSP 500 Pro cutting out mid-playback on a battery that shows full charge

The LSP 500 Pro draws from two loads simultaneously — the Class D amplifier and the wireless radio module. Under peak volume, combined current draw can spike enough to pull cell voltage below the BMS protection threshold momentarily, triggering a cutoff even when the charge indicator reads high. This typically appears in the first few cycles on a new pack before the cells have reached full capacity through conditioning. Run three to five full charge-discharge cycles at moderate volume and the BMS trip threshold will track more accurately against the actual cell state. If cutouts persist past five cycles at the same load level, check that the base station charge contacts are clean and making full contact.