From ATI-Audio the BBU100-1 houses four 9-volt alkaline or lithium batteries and mounts to the underside of the NANOAMP case, PROK-1 quick change mounts or ABAG-1 carry case. The BBU100-1 will power a mixer for up to six hours.
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ATI Audio Inc BBU100-1 Battery Housing for Four 9-Volt Alkaline or Lithium Batteries