Keystone 18650 Battery Holder - For Button Top 18650 Battery – The Saber Armory
Amazon.com: BestTong 18650 Battery Case Holder, 2 Slots 3.7V DIY Battery Storage Box in Parallel or Series Plastic Batteries Case with Clips Pins Contacts for Soldering 2 x 18650 Pack of 2 : Electronics
1-cell 18650 Battery Holder - Solarbotics Ltd.
Battery holder: Li-Ion 18650 Battery Holder (1S4P) With 2.6" long 20AWG & PCB (1S4P-18650)