Repair guide: UNIT-4 battery

Some components are expected to wear out over UNIT-4’s lifetime - main examples being batteries and speaker drivers. UNIT-4 has been designed to be disassembled with glue-free design by anyone with 2 screwdrivers and AIAIAI’s step by step repair guides. This will make sure your UNIT-4's will stay with you for as long as possible.


All you need is a thin, hard plastic tool or an old credit card and 2 cross head screwdrivers. We use a Phillips 00 and a Phillips 2.


Remove the front panel

  • Make sure UNIT-4 is turned off.
  • Use a thin, hard plastic tool or an old credit card and pull off the front panel.

Remove front housing

  • Take a screwdriver and remove all 16 screws as shown on the image below.

  • Place UNIT-4 upright and carefully lean forward while supporting the front.
  • If the front housing is too tight, we recommend using a flathead screwdriver or similar to pull the housing out. You can do this by pulling it out by the magnet locks.

Disconnect back housing cables

  • Disconnect the 6 connectors on the back edge of the main circuit board.

Remove battery pack screws and battery packs

  • Take a screwdriver and remove the 2 screws from each side.

  • Lift out the battery packs.

Install new battery packs

  • Slide battery packs in to place. The pack with the connectors is on the right hand side.
  • Push the connecting cable underneath the bass vent.
  • Hand tighten the 2 screws in each side.

Reconnect the cables

  • Reconnect the 6 connectors to the main circuit board.

Fix in front housing

  • Carefully tilt up the front housing and push into place. 
  • Make sure no cables are trapped.
  • Add all the 16 screws and hand tighten.

Mount front panel

  • Take the front panel and place on top of the front housing.
  • Push with 2 thumbs on the 8 points shown below.

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