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Protecting 18650 Lithium Ion Battery

The 18650 lithium ion rechargeable battery cell is commonly used inside notebook computers. They are available in both 3.7v and 3.6v versions. Notebook battery packs that uses 3.7v battery cells, most likely, will not work with 3.6v cells. The opposite may or may not be true, but it's not worth find out, because it is possible to damage the notebook with higher voltage.

When lithium ion batteries discharges past a certain threshold, there is a chance for them to catch fire or explode. Therefore, notebook battery packs contains circuits to cut off discharge prior to the threshold.

Bare 18650 battery cells are available with or without the protection circuit. If you purchase individual cells to rebuild notebook battery packs, then you want the unprotected version. However, if you have other purposes, then you may want the protected version. The only difference between the two is the extra protective circuit board mounted on the battery cell.

If you have some unprotected 18650 battery cells, but you want to use them individually, then you should protect them. This article shows you how to turn unprotected 18650 battery cells into protected 18650 battery cells.

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Protection Circuit

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Tools

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Assembly

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