Sharp GX-BT280 replacement battery replacement

ID: 218623

Description: The Bluetooth speaker will only work when...

Steps:

  1. Use a suitable tool to pry open the grille cover at the marked positions. It is best to use the small plastic prying tools typically used for phone repairs.
  2. The grille cover is a single piece but can be hinged open so that it can be completely removed.
    3. Step image
  3. Use a small Phillips screwdriver to remove the 6 screws marked in red.
  4. The strip hangs slightly under the end caps at the orange marks. Do not remove the strip yet.
    5. Step image
  5. One end cap, and really only one, is secured with 4 small Phillips screws. It is the end cap at the end where the "volume down" button is located.
  6. Remove the 4 screws and remove the end cap.
  7. If you can now remove the switch cover strip from the previous step without bending or breaking anything, you can do so now. Otherwise, complete the next step first.
    8. Step image
  8. The end cap attached to the end of the "volume up" button is glued on, not screwed in. Thanks Sharp!
  9. This cap must be knocked off with force and may, of course, be damaged in the process. It is best if one person holds the speaker and another person gives properly measured blows with a hammer to a well-positioned screwdriver. Naturally, strike away from the person to avoid any risk of injury.
  10. By this point at the latest, the switch cover from the penultimate step can be removed.
  11. Remove the 6 marked screws. When reassembling later, make sure to note that one tab (highlighted in orange in the image) is slightly wider than the others.
  12. Remove the black ring. Beneath the ring is a rubber membrane; remove this as well. It may be slightly stuck, but it can be easily released.
  13. Afterwards, you have an initial look inside. It may be helpful to use a thick rubber band to hold the two halves of the speaker together.
  14. Proceed accordingly on the other side of the speaker.
    15. Step image Step image Step image
  15. The two halves of the speaker can now be carefully opened slightly. Note that both halves are connected by cables, so do not pull them completely apart.
  16. The battery is secured with a bracket held by two screws (only one visible in the image). Release both screws and the battery connector (see second image), then the battery can be removed.
    17. Step image Step image
  17. In principle, insert a new battery and reassemble everything. If only the battery were that easy to get...
  18. The original battery has the label 1NR19/66 3.7V 2800mAh 10.36Wh on the blue film. If you remove the film, the cell underneath is labeled INR18650P 3.6V. Both type designations are basically okay. But...
  19. The battery has 3 terminals; the third terminal (white wire) is for battery monitoring. It is essential to buy a battery of the above type with 3 wires. Furthermore, the connector must have the same pinout as the original, meaning the wire for battery monitoring must be in the middle.
  20. There are various models available to buy in German shops (15-20 EUR), as well as on AliExpress (3 EUR). If the wiring does not match, as was the case for me, then unsolder the old cable and solder it to the new battery according to the correct polarity.
  21. It is really important to pay attention when soldering to where the positive, negative, and control wires must be attached on the new battery. This can be different for every model. You can see the original battery in the reference image.
  22. After resoldering, if that was necessary, reseal the blue plastic film with electrical tape.
    23. Step image
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