1042 BLACK single 18650 battery holder sled clip - Gold plated - - Amazon.com
Single 18650 Battery Case Holder
Battery holder : Li-Ion 18650 Battery Holder (1S1P) With 2.6" long 20AWG & PCB (1S1P-18650)
18650 Single Cell Holder
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I found the perfect case for a single, unprotected 18650. : r/18650masterrace