I took apart a very old laptop and the cells I found inside the battery were 17670 (the full name is SF US17670GR). I was planning on using them for a DIY power bank from aliexpress, but the industry standard of lithium ion cells is 18650.

So I want to know if I can safely stick 17670 cells into a 18650 power bank regarding both size and safe charging

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    \$\begingroup\$ With enough brute force anything is possible. \$\endgroup\$ – Dampmaskin Dec 4 '17 at 13:09
  • \$\begingroup\$ I meant to ask regarding safe charging, not size, I will edit my question to make that clear \$\endgroup\$ – David Dec 4 '17 at 13:12
  • \$\begingroup\$ For that you have to check if the nominal voltage, maximum voltage, minimum voltage, maximum charging current and maximum discharge current is compatible. \$\endgroup\$ – Dampmaskin Dec 4 '17 at 13:14
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    \$\begingroup\$ If you Google a bit you can easily find the size of an 18650. Compare that to the size of your 17670. Since the laptop is very old, the cells will have worn out. I seriously doubt if it makes sense to re-purpose such worn-out cells. \$\endgroup\$ – Bimpelrekkie Dec 4 '17 at 13:14
  • \$\begingroup\$ The sizes are in the number: an 18650 is 18 mm in diameter, 65 mm long, and the 0 I believe indicates that the cell is sylindrical. It follows that a 17670 is a cylindrical cell of diameter 17 mm and length 67 mm. But if the question is about the electrical/chemical properties, I don't know why the question focuses on the physical size. \$\endgroup\$ – Dampmaskin Dec 4 '17 at 13:16

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