Extend the runtime of your Bose S1 Pro+ wireless system with an additional battery or by replacing the old one. This lithiumion battery provides up to 11 hours of playtime per charge and can be securely and reliably stored in a specially designed compartment of the S1 Pro+. Up to 11 hours of operating time for reliable performance even at high sound levels. The lithiumion battery technology delivers high energy density for powerful sound reproduction of your S1 Pro+ system without compromising on volume. For longlasting use and safe, easy charging, the battery can be integrated into a dedicated compartment in the S1 Pro+ system.