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18650 Battery Wraps (5 pack)$1.00
Why do we need 18650 battery wraps?
Using 18650s without wrap is dangerous since the whole body is actually negative terminal. If you use it without wrap your 18650 could short and potentially caught on fire or explode.
If you salvage 18650s from battery laptop battery you could use this guide to rewrap your batteries since most of them are glued inside and the only way to get them out is to damage wrap.