The Bose S1 Pro Rechargeable Battery Pack is designed for the Bose S1 Pro Portable PA Speaker. The Bose S1 Pro battery pack provides up to 6 hours of operation from a single charge, perfect for performances and conferences alike. The S1 Pro Battery Pack can be trickle charged while the speaker is powered via an AC supply or quick charged when the speaker is not being used. Featuring a compact and lightweight design, the S1 Pro battery pack can be installed within a dedicated compartment for safe and convenient charging.