The Mackie GB-10 rechargeable battery provides extended battery life for your ProFX10 GO battery-powered mixer. You'll get up to eight hours of high-headroom analog mixing from this rechargeable battery. It can charge inside or outside the mixer, allowing you to power the mixer with one battery while charging a spare. When the first battery runs low, swap in the fresh one to keep mixing without interruption. This spare battery effectively doubles your potential battery life, giving you the flexibility to perform at extended gigs or sessions without being tethered to a power outlet.