Check the listing for details. Mackie Thump GO Spare Battery. Condition: New. Listed at 69.99 USD. Backup or Replacement Battery for Your Thump GO If you're needing to replace an older battery or you are just looking to stash a backup, then Sweetwater recommends this rechargeable lithium-ion battery pack for your Mackie Thump GO 8-inch Portable Loudspeaker. With up to 12 hours of battery life on a single charge, this loudspeaker battery is the perfectly reliable choice for extended playback time no matter where you take your Thump GO, whether streaming inside via Bluetooth or using it as an outdoor PA. Refer to your Thump GO's tri-color battery life indicator to give you an up-to-speed idea of just how much life is left before you need to recharge. Also included with your battery pack is a Quick Start Guide to make your battery swap and speaker setup easy.