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The cells are welded together with contact strips, you need a spot welder to rebuild a pack. Making cells removable isn’t economic, because vibration resistant

• cerebellum42 8y ago
  While I agree that it's reasonable to make 18650 based packs not officially user serviceable (because of the spot welding thing and because that would open up liability to repairs gone wrong), at least they should be made so the cells can be replaced by someone who has a spotwelder and some electrical knowledge. Basically give the pack housing a nondestructive way to be opened and resealed. That way even if the manufacturer decides to switch battery pack standards in a few years, someone with the necessary knowledge can still get some 18650 cells and be fine.
• perilunar 8y ago
  > Making cells removable isn’t economic I disagree. Until relatively recently all battery powered devices had removable batteries, which is why we have standard battery sizes in the first place. Welded and sealed proprietary battery packs are a backward step.
  • ben-schaaf 8y ago
    The keyword here is "cell", not pack. I have never seen individual cells being removable. Imagine the increased complexity/cost and decreased reliability if each of the 6 cells in a standard car batter was individually replaceable.
    • perilunar 8y ago
      > I have never seen individual cells being removable Sure you have. Any device with removable single-cell 'batteries' has removable cells. > Imagine the increased complexity/cost and decreased reliability if each of the 6 cells in a standard car batter was individually replaceable. Car batteries are already removable and replaceable, and come in standard sizes, which is precisely the point.